2 dnl Copyright (C) 2003, 2007-2011 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 dnl Test whether the *printf family of functions supports the 'j', 'z', 't',
8 dnl 'L' size specifiers. (ISO C99, POSIX:2001)
9 dnl Result is gl_cv_func_printf_sizes_c99.
11 AC_DEFUN([gl_PRINTF_SIZES_C99],
13 AC_REQUIRE([AC_PROG_CC])
14 AC_REQUIRE([gl_AC_HEADER_STDINT_H])
15 AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])
16 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
17 AC_CACHE_CHECK([whether printf supports size specifiers as in C99],
18 [gl_cv_func_printf_sizes_c99],
25 #include <sys/types.h>
26 #if HAVE_STDINT_H_WITH_UINTMAX
29 #if HAVE_INTTYPES_H_WITH_UINTMAX
30 # include <inttypes.h>
36 #if HAVE_STDINT_H_WITH_UINTMAX || HAVE_INTTYPES_H_WITH_UINTMAX
38 if (sprintf (buf, "%ju %d", (uintmax_t) 12345671, 33, 44, 55) < 0
39 || strcmp (buf, "12345671 33") != 0)
43 if (sprintf (buf, "%zu %d", (size_t) 12345672, 33, 44, 55) < 0
44 || strcmp (buf, "12345672 33") != 0)
47 if (sprintf (buf, "%tu %d", (ptrdiff_t) 12345673, 33, 44, 55) < 0
48 || strcmp (buf, "12345673 33") != 0)
51 if (sprintf (buf, "%Lg %d", (long double) 1.5, 33, 44, 55) < 0
52 || strcmp (buf, "1.5 33") != 0)
56 [gl_cv_func_printf_sizes_c99=yes],
57 [gl_cv_func_printf_sizes_c99=no],
61 # Guess yes on glibc systems.
62 *-gnu*) gl_cv_func_printf_sizes_c99="guessing yes";;
63 # Guess yes on FreeBSD >= 5.
64 freebsd[1-4]*) gl_cv_func_printf_sizes_c99="guessing no";;
65 freebsd* | kfreebsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
66 # Guess yes on MacOS X >= 10.3.
67 darwin[1-6].*) gl_cv_func_printf_sizes_c99="guessing no";;
68 darwin*) gl_cv_func_printf_sizes_c99="guessing yes";;
69 # Guess yes on OpenBSD >= 3.9.
70 openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
71 gl_cv_func_printf_sizes_c99="guessing no";;
72 openbsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
73 # Guess yes on Solaris >= 2.10.
74 solaris2.[1-9][0-9]*) gl_cv_func_printf_sizes_c99="guessing yes";;
75 solaris*) gl_cv_func_printf_sizes_c99="guessing no";;
76 # Guess yes on NetBSD >= 3.
77 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
78 gl_cv_func_printf_sizes_c99="guessing no";;
79 netbsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
80 # If we don't know, assume the worst.
81 *) gl_cv_func_printf_sizes_c99="guessing no";;
88 dnl Test whether the *printf family of functions supports 'long double'
89 dnl arguments together with the 'L' size specifier. (ISO C99, POSIX:2001)
90 dnl Result is gl_cv_func_printf_long_double.
92 AC_DEFUN([gl_PRINTF_LONG_DOUBLE],
94 AC_REQUIRE([AC_PROG_CC])
95 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
96 AC_CACHE_CHECK([whether printf supports 'long double' arguments],
97 [gl_cv_func_printf_long_double],
103 static char buf[10000];
108 if (sprintf (buf, "%Lf %d", 1.75L, 33, 44, 55) < 0
109 || strcmp (buf, "1.750000 33") != 0)
112 if (sprintf (buf, "%Le %d", 1.75L, 33, 44, 55) < 0
113 || strcmp (buf, "1.750000e+00 33") != 0)
116 if (sprintf (buf, "%Lg %d", 1.75L, 33, 44, 55) < 0
117 || strcmp (buf, "1.75 33") != 0)
121 [gl_cv_func_printf_long_double=yes],
122 [gl_cv_func_printf_long_double=no],
126 beos*) gl_cv_func_printf_long_double="guessing no";;
127 mingw* | pw*) gl_cv_func_printf_long_double="guessing no";;
128 *) gl_cv_func_printf_long_double="guessing yes";;
135 dnl Test whether the *printf family of functions supports infinite and NaN
136 dnl 'double' arguments and negative zero arguments in the %f, %e, %g
137 dnl directives. (ISO C99, POSIX:2001)
138 dnl Result is gl_cv_func_printf_infinite.
140 AC_DEFUN([gl_PRINTF_INFINITE],
142 AC_REQUIRE([AC_PROG_CC])
143 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
144 AC_CACHE_CHECK([whether printf supports infinite 'double' arguments],
145 [gl_cv_func_printf_infinite],
152 strisnan (const char *string, size_t start_index, size_t end_index)
154 if (start_index < end_index)
156 if (string[start_index] == '-')
158 if (start_index + 3 <= end_index
159 && memcmp (string + start_index, "nan", 3) == 0)
162 if (start_index == end_index
163 || (string[start_index] == '(' && string[end_index - 1] == ')'))
172 static double plus_zero = 0.0;
173 double minus_zero = - plus_zero;
174 return memcmp (&plus_zero, &minus_zero, sizeof (double)) != 0;
176 static char buf[10000];
177 static double zero = 0.0;
181 if (sprintf (buf, "%f", 1.0 / 0.0) < 0
182 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
184 if (sprintf (buf, "%f", -1.0 / 0.0) < 0
185 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
187 if (sprintf (buf, "%f", zero / zero) < 0
188 || !strisnan (buf, 0, strlen (buf)))
190 if (sprintf (buf, "%e", 1.0 / 0.0) < 0
191 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
193 if (sprintf (buf, "%e", -1.0 / 0.0) < 0
194 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
196 if (sprintf (buf, "%e", zero / zero) < 0
197 || !strisnan (buf, 0, strlen (buf)))
199 if (sprintf (buf, "%g", 1.0 / 0.0) < 0
200 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
202 if (sprintf (buf, "%g", -1.0 / 0.0) < 0
203 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
205 if (sprintf (buf, "%g", zero / zero) < 0
206 || !strisnan (buf, 0, strlen (buf)))
208 /* This test fails on HP-UX 10.20. */
209 if (have_minus_zero ())
210 if (sprintf (buf, "%g", - zero) < 0
211 || strcmp (buf, "-0") != 0)
215 [gl_cv_func_printf_infinite=yes],
216 [gl_cv_func_printf_infinite=no],
220 # Guess yes on glibc systems.
221 *-gnu*) gl_cv_func_printf_infinite="guessing yes";;
222 # Guess yes on FreeBSD >= 6.
223 freebsd[1-5]*) gl_cv_func_printf_infinite="guessing no";;
224 freebsd* | kfreebsd*) gl_cv_func_printf_infinite="guessing yes";;
225 # Guess yes on MacOS X >= 10.3.
226 darwin[1-6].*) gl_cv_func_printf_infinite="guessing no";;
227 darwin*) gl_cv_func_printf_infinite="guessing yes";;
228 # Guess yes on HP-UX >= 11.
229 hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite="guessing no";;
230 hpux*) gl_cv_func_printf_infinite="guessing yes";;
231 # Guess yes on NetBSD >= 3.
232 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
233 gl_cv_func_printf_infinite="guessing no";;
234 netbsd*) gl_cv_func_printf_infinite="guessing yes";;
236 beos*) gl_cv_func_printf_infinite="guessing yes";;
237 # If we don't know, assume the worst.
238 *) gl_cv_func_printf_infinite="guessing no";;
245 dnl Test whether the *printf family of functions supports infinite and NaN
246 dnl 'long double' arguments in the %f, %e, %g directives. (ISO C99, POSIX:2001)
247 dnl Result is gl_cv_func_printf_infinite_long_double.
249 AC_DEFUN([gl_PRINTF_INFINITE_LONG_DOUBLE],
251 AC_REQUIRE([gl_PRINTF_LONG_DOUBLE])
252 AC_REQUIRE([AC_PROG_CC])
253 AC_REQUIRE([gl_BIGENDIAN])
254 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
255 dnl The user can set or unset the variable gl_printf_safe to indicate
256 dnl that he wishes a safe handling of non-IEEE-754 'long double' values.
257 if test -n "$gl_printf_safe"; then
258 AC_DEFINE([CHECK_PRINTF_SAFE], [1],
259 [Define if you wish *printf() functions that have a safe handling of
260 non-IEEE-754 'long double' values.])
262 case "$gl_cv_func_printf_long_double" in
264 AC_CACHE_CHECK([whether printf supports infinite 'long double' arguments],
265 [gl_cv_func_printf_infinite_long_double],
274 strisnan (const char *string, size_t start_index, size_t end_index)
276 if (start_index < end_index)
278 if (string[start_index] == '-')
280 if (start_index + 3 <= end_index
281 && memcmp (string + start_index, "nan", 3) == 0)
284 if (start_index == end_index
285 || (string[start_index] == '(' && string[end_index - 1] == ')'))
291 static char buf[10000];
292 static long double zeroL = 0.0L;
297 if (sprintf (buf, "%Lf", 1.0L / 0.0L) < 0
298 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
300 if (sprintf (buf, "%Lf", -1.0L / 0.0L) < 0
301 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
303 if (sprintf (buf, "%Lf", zeroL / zeroL) < 0
304 || !strisnan (buf, 0, strlen (buf)))
306 if (sprintf (buf, "%Le", 1.0L / 0.0L) < 0
307 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
309 if (sprintf (buf, "%Le", -1.0L / 0.0L) < 0
310 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
312 if (sprintf (buf, "%Le", zeroL / zeroL) < 0
313 || !strisnan (buf, 0, strlen (buf)))
315 if (sprintf (buf, "%Lg", 1.0L / 0.0L) < 0
316 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
318 if (sprintf (buf, "%Lg", -1.0L / 0.0L) < 0
319 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
321 if (sprintf (buf, "%Lg", zeroL / zeroL) < 0
322 || !strisnan (buf, 0, strlen (buf)))
324 #if CHECK_PRINTF_SAFE && ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_))
325 /* Representation of an 80-bit 'long double' as an initializer for a sequence
326 of 'unsigned int' words. */
327 # ifdef WORDS_BIGENDIAN
328 # define LDBL80_WORDS(exponent,manthi,mantlo) \
329 { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
330 ((unsigned int) (manthi) << 16) | (unsigned int) (mantlo) >> 16), \
331 (unsigned int) (mantlo) << 16 \
334 # define LDBL80_WORDS(exponent,manthi,mantlo) \
335 { mantlo, manthi, exponent }
338 static union { unsigned int word[4]; long double value; } x =
339 { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
340 if (sprintf (buf, "%Lf", x.value) < 0
341 || !strisnan (buf, 0, strlen (buf)))
343 if (sprintf (buf, "%Le", x.value) < 0
344 || !strisnan (buf, 0, strlen (buf)))
346 if (sprintf (buf, "%Lg", x.value) < 0
347 || !strisnan (buf, 0, strlen (buf)))
351 /* Signalling NaN. */
352 static union { unsigned int word[4]; long double value; } x =
353 { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
354 if (sprintf (buf, "%Lf", x.value) < 0
355 || !strisnan (buf, 0, strlen (buf)))
357 if (sprintf (buf, "%Le", x.value) < 0
358 || !strisnan (buf, 0, strlen (buf)))
360 if (sprintf (buf, "%Lg", x.value) < 0
361 || !strisnan (buf, 0, strlen (buf)))
365 static union { unsigned int word[4]; long double value; } x =
366 { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
367 if (sprintf (buf, "%Lf", x.value) < 0
368 || !strisnan (buf, 0, strlen (buf)))
370 if (sprintf (buf, "%Le", x.value) < 0
371 || !strisnan (buf, 0, strlen (buf)))
373 if (sprintf (buf, "%Lg", x.value) < 0
374 || !strisnan (buf, 0, strlen (buf)))
377 { /* Pseudo-Infinity. */
378 static union { unsigned int word[4]; long double value; } x =
379 { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
380 if (sprintf (buf, "%Lf", x.value) < 0
381 || !strisnan (buf, 0, strlen (buf)))
383 if (sprintf (buf, "%Le", x.value) < 0
384 || !strisnan (buf, 0, strlen (buf)))
386 if (sprintf (buf, "%Lg", x.value) < 0
387 || !strisnan (buf, 0, strlen (buf)))
391 static union { unsigned int word[4]; long double value; } x =
392 { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
393 if (sprintf (buf, "%Lf", x.value) < 0
394 || !strisnan (buf, 0, strlen (buf)))
396 if (sprintf (buf, "%Le", x.value) < 0
397 || !strisnan (buf, 0, strlen (buf)))
399 if (sprintf (buf, "%Lg", x.value) < 0
400 || !strisnan (buf, 0, strlen (buf)))
403 { /* Unnormalized number. */
404 static union { unsigned int word[4]; long double value; } x =
405 { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
406 if (sprintf (buf, "%Lf", x.value) < 0
407 || !strisnan (buf, 0, strlen (buf)))
409 if (sprintf (buf, "%Le", x.value) < 0
410 || !strisnan (buf, 0, strlen (buf)))
412 if (sprintf (buf, "%Lg", x.value) < 0
413 || !strisnan (buf, 0, strlen (buf)))
416 { /* Pseudo-Denormal. */
417 static union { unsigned int word[4]; long double value; } x =
418 { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
419 if (sprintf (buf, "%Lf", x.value) < 0
420 || !strisnan (buf, 0, strlen (buf)))
422 if (sprintf (buf, "%Le", x.value) < 0
423 || !strisnan (buf, 0, strlen (buf)))
425 if (sprintf (buf, "%Lg", x.value) < 0
426 || !strisnan (buf, 0, strlen (buf)))
432 [gl_cv_func_printf_infinite_long_double=yes],
433 [gl_cv_func_printf_infinite_long_double=no],
437 # Guess no on ia64, x86_64, i386.
438 ia64 | x86_64 | i*86) gl_cv_func_printf_infinite_long_double="guessing no";;
441 # Guess yes on glibc systems.
442 *-gnu*) gl_cv_func_printf_infinite_long_double="guessing yes";;
443 # Guess yes on FreeBSD >= 6.
444 freebsd[1-5]*) gl_cv_func_printf_infinite_long_double="guessing no";;
445 freebsd* | kfreebsd*) gl_cv_func_printf_infinite_long_double="guessing yes";;
446 # Guess yes on HP-UX >= 11.
447 hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite_long_double="guessing no";;
448 hpux*) gl_cv_func_printf_infinite_long_double="guessing yes";;
449 # If we don't know, assume the worst.
450 *) gl_cv_func_printf_infinite_long_double="guessing no";;
459 gl_cv_func_printf_infinite_long_double="irrelevant"
464 dnl Test whether the *printf family of functions supports the 'a' and 'A'
465 dnl conversion specifier for hexadecimal output of floating-point numbers.
466 dnl (ISO C99, POSIX:2001)
467 dnl Result is gl_cv_func_printf_directive_a.
469 AC_DEFUN([gl_PRINTF_DIRECTIVE_A],
471 AC_REQUIRE([AC_PROG_CC])
472 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
473 AC_CACHE_CHECK([whether printf supports the 'a' and 'A' directives],
474 [gl_cv_func_printf_directive_a],
480 static char buf[100];
484 if (sprintf (buf, "%a %d", 3.1416015625, 33, 44, 55) < 0
485 || (strcmp (buf, "0x1.922p+1 33") != 0
486 && strcmp (buf, "0x3.244p+0 33") != 0
487 && strcmp (buf, "0x6.488p-1 33") != 0
488 && strcmp (buf, "0xc.91p-2 33") != 0))
490 if (sprintf (buf, "%A %d", -3.1416015625, 33, 44, 55) < 0
491 || (strcmp (buf, "-0X1.922P+1 33") != 0
492 && strcmp (buf, "-0X3.244P+0 33") != 0
493 && strcmp (buf, "-0X6.488P-1 33") != 0
494 && strcmp (buf, "-0XC.91P-2 33") != 0))
496 /* This catches a FreeBSD 6.1 bug: it doesn't round. */
497 if (sprintf (buf, "%.2a %d", 1.51, 33, 44, 55) < 0
498 || (strcmp (buf, "0x1.83p+0 33") != 0
499 && strcmp (buf, "0x3.05p-1 33") != 0
500 && strcmp (buf, "0x6.0ap-2 33") != 0
501 && strcmp (buf, "0xc.14p-3 33") != 0))
503 /* This catches a FreeBSD 6.1 bug. See
504 <http://lists.gnu.org/archive/html/bug-gnulib/2007-04/msg00107.html> */
505 if (sprintf (buf, "%010a %d", 1.0 / 0.0, 33, 44, 55) < 0
508 /* This catches a MacOS X 10.3.9 (Darwin 7.9) bug. */
509 if (sprintf (buf, "%.1a", 1.999) < 0
510 || (strcmp (buf, "0x1.0p+1") != 0
511 && strcmp (buf, "0x2.0p+0") != 0
512 && strcmp (buf, "0x4.0p-1") != 0
513 && strcmp (buf, "0x8.0p-2") != 0))
515 /* This catches the same MacOS X 10.3.9 (Darwin 7.9) bug and also a
516 glibc 2.4 bug <http://sourceware.org/bugzilla/show_bug.cgi?id=2908>. */
517 if (sprintf (buf, "%.1La", 1.999L) < 0
518 || (strcmp (buf, "0x1.0p+1") != 0
519 && strcmp (buf, "0x2.0p+0") != 0
520 && strcmp (buf, "0x4.0p-1") != 0
521 && strcmp (buf, "0x8.0p-2") != 0))
525 [gl_cv_func_printf_directive_a=yes],
526 [gl_cv_func_printf_directive_a=no],
529 # Guess yes on glibc >= 2.5 systems.
531 AC_EGREP_CPP([BZ2908], [
532 #include <features.h>
533 #ifdef __GNU_LIBRARY__
534 #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 5) || (__GLIBC__ > 2)) && !defined __UCLIBC__
539 [gl_cv_func_printf_directive_a="guessing yes"],
540 [gl_cv_func_printf_directive_a="guessing no"])
542 # If we don't know, assume the worst.
543 *) gl_cv_func_printf_directive_a="guessing no";;
549 dnl Test whether the *printf family of functions supports the %F format
550 dnl directive. (ISO C99, POSIX:2001)
551 dnl Result is gl_cv_func_printf_directive_f.
553 AC_DEFUN([gl_PRINTF_DIRECTIVE_F],
555 AC_REQUIRE([AC_PROG_CC])
556 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
557 AC_CACHE_CHECK([whether printf supports the 'F' directive],
558 [gl_cv_func_printf_directive_f],
564 static char buf[100];
568 if (sprintf (buf, "%F %d", 1234567.0, 33, 44, 55) < 0
569 || strcmp (buf, "1234567.000000 33") != 0)
571 if (sprintf (buf, "%F", 1.0 / 0.0) < 0
572 || (strcmp (buf, "INF") != 0 && strcmp (buf, "INFINITY") != 0))
574 /* This catches a Cygwin 1.5.x bug. */
575 if (sprintf (buf, "%.F", 1234.0) < 0
576 || strcmp (buf, "1234") != 0)
580 [gl_cv_func_printf_directive_f=yes],
581 [gl_cv_func_printf_directive_f=no],
585 # Guess yes on glibc systems.
586 *-gnu*) gl_cv_func_printf_directive_f="guessing yes";;
587 # Guess yes on FreeBSD >= 6.
588 freebsd[1-5]*) gl_cv_func_printf_directive_f="guessing no";;
589 freebsd* | kfreebsd*) gl_cv_func_printf_directive_f="guessing yes";;
590 # Guess yes on MacOS X >= 10.3.
591 darwin[1-6].*) gl_cv_func_printf_directive_f="guessing no";;
592 darwin*) gl_cv_func_printf_directive_f="guessing yes";;
593 # Guess yes on Solaris >= 2.10.
594 solaris2.[1-9][0-9]*) gl_cv_func_printf_sizes_c99="guessing yes";;
595 solaris*) gl_cv_func_printf_sizes_c99="guessing no";;
596 # If we don't know, assume the worst.
597 *) gl_cv_func_printf_directive_f="guessing no";;
604 dnl Test whether the *printf family of functions supports the %n format
605 dnl directive. (ISO C99, POSIX:2001)
606 dnl Result is gl_cv_func_printf_directive_n.
608 AC_DEFUN([gl_PRINTF_DIRECTIVE_N],
610 AC_REQUIRE([AC_PROG_CC])
611 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
612 AC_CACHE_CHECK([whether printf supports the 'n' directive],
613 [gl_cv_func_printf_directive_n],
619 static char fmtstring[10];
620 static char buf[100];
624 /* Copy the format string. Some systems (glibc with _FORTIFY_SOURCE=2)
625 support %n in format strings in read-only memory but not in writable
627 strcpy (fmtstring, "%d %n");
628 if (sprintf (buf, fmtstring, 123, &count, 33, 44, 55) < 0
629 || strcmp (buf, "123 ") != 0
634 [gl_cv_func_printf_directive_n=yes],
635 [gl_cv_func_printf_directive_n=no],
639 *) gl_cv_func_printf_directive_n="guessing yes";;
646 dnl Test whether the *printf family of functions supports the %ls format
647 dnl directive and in particular, when a precision is specified, whether
648 dnl the functions stop converting the wide string argument when the number
649 dnl of bytes that have been produced by this conversion equals or exceeds
651 dnl Result is gl_cv_func_printf_directive_ls.
653 AC_DEFUN([gl_PRINTF_DIRECTIVE_LS],
655 AC_REQUIRE([AC_PROG_CC])
656 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
657 AC_CACHE_CHECK([whether printf supports the 'ls' directive],
658 [gl_cv_func_printf_directive_ls],
662 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
664 BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
665 included before <wchar.h>. */
675 /* Test whether %ls works at all.
676 This test fails on OpenBSD 4.0, IRIX 6.5, Solaris 2.6, Haiku, but not on
679 static const wchar_t wstring[] = { 'a', 'b', 'c', 0 };
681 if (sprintf (buf, "%ls", wstring) < 0
682 || strcmp (buf, "abc") != 0)
685 /* This test fails on IRIX 6.5, Solaris 2.6, Cygwin 1.5, Haiku (with an
686 assertion failure inside libc), but not on OpenBSD 4.0. */
688 static const wchar_t wstring[] = { 'a', 0 };
690 if (sprintf (buf, "%ls", wstring) < 0
691 || strcmp (buf, "a") != 0)
694 /* Test whether precisions in %ls are supported as specified in ISO C 99
696 "If a precision is specified, no more than that many bytes are written
697 (including shift sequences, if any), and the array shall contain a
698 null wide character if, to equal the multibyte character sequence
699 length given by the precision, the function would need to access a
700 wide character one past the end of the array."
701 This test fails on Solaris 10. */
703 static const wchar_t wstring[] = { 'a', 'b', (wchar_t) 0xfdfdfdfd, 0 };
705 if (sprintf (buf, "%.2ls", wstring) < 0
706 || strcmp (buf, "ab") != 0)
711 [gl_cv_func_printf_directive_ls=yes],
712 [gl_cv_func_printf_directive_ls=no],
716 openbsd*) gl_cv_func_printf_directive_ls="guessing no";;
717 irix*) gl_cv_func_printf_directive_ls="guessing no";;
718 solaris*) gl_cv_func_printf_directive_ls="guessing no";;
719 cygwin*) gl_cv_func_printf_directive_ls="guessing no";;
720 beos* | haiku*) gl_cv_func_printf_directive_ls="guessing no";;
721 *) gl_cv_func_printf_directive_ls="guessing yes";;
728 dnl Test whether the *printf family of functions supports POSIX/XSI format
729 dnl strings with positions. (POSIX:2001)
730 dnl Result is gl_cv_func_printf_positions.
732 AC_DEFUN([gl_PRINTF_POSITIONS],
734 AC_REQUIRE([AC_PROG_CC])
735 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
736 AC_CACHE_CHECK([whether printf supports POSIX/XSI format strings with positions],
737 [gl_cv_func_printf_positions],
743 /* The string "%2$d %1$d", with dollar characters protected from the shell's
744 dollar expansion (possibly an autoconf bug). */
745 static char format[] = { '%', '2', '$', 'd', ' ', '%', '1', '$', 'd', '\0' };
746 static char buf[100];
749 sprintf (buf, format, 33, 55);
750 return (strcmp (buf, "55 33") != 0);
752 [gl_cv_func_printf_positions=yes],
753 [gl_cv_func_printf_positions=no],
757 netbsd[1-3]* | netbsdelf[1-3]* | netbsdaout[1-3]* | netbsdcoff[1-3]*)
758 gl_cv_func_printf_positions="guessing no";;
759 beos*) gl_cv_func_printf_positions="guessing no";;
760 mingw* | pw*) gl_cv_func_printf_positions="guessing no";;
761 *) gl_cv_func_printf_positions="guessing yes";;
768 dnl Test whether the *printf family of functions supports POSIX/XSI format
769 dnl strings with the ' flag for grouping of decimal digits. (POSIX:2001)
770 dnl Result is gl_cv_func_printf_flag_grouping.
772 AC_DEFUN([gl_PRINTF_FLAG_GROUPING],
774 AC_REQUIRE([AC_PROG_CC])
775 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
776 AC_CACHE_CHECK([whether printf supports the grouping flag],
777 [gl_cv_func_printf_flag_grouping],
783 static char buf[100];
786 if (sprintf (buf, "%'d %d", 1234567, 99) < 0
787 || buf[strlen (buf) - 1] != '9')
791 [gl_cv_func_printf_flag_grouping=yes],
792 [gl_cv_func_printf_flag_grouping=no],
796 cygwin*) gl_cv_func_printf_flag_grouping="guessing no";;
797 netbsd*) gl_cv_func_printf_flag_grouping="guessing no";;
798 mingw* | pw*) gl_cv_func_printf_flag_grouping="guessing no";;
799 *) gl_cv_func_printf_flag_grouping="guessing yes";;
806 dnl Test whether the *printf family of functions supports the - flag correctly.
808 dnl <http://lists.gnu.org/archive/html/bug-coreutils/2008-02/msg00035.html>
809 dnl Result is gl_cv_func_printf_flag_leftadjust.
811 AC_DEFUN([gl_PRINTF_FLAG_LEFTADJUST],
813 AC_REQUIRE([AC_PROG_CC])
814 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
815 AC_CACHE_CHECK([whether printf supports the left-adjust flag correctly],
816 [gl_cv_func_printf_flag_leftadjust],
822 static char buf[100];
825 /* Check that a '-' flag is not annihilated by a negative width. */
826 if (sprintf (buf, "a%-*sc", -3, "b") < 0
827 || strcmp (buf, "ab c") != 0)
831 [gl_cv_func_printf_flag_leftadjust=yes],
832 [gl_cv_func_printf_flag_leftadjust=no],
836 # Guess yes on HP-UX 11.
837 hpux11*) gl_cv_func_printf_flag_leftadjust="guessing yes";;
838 # Guess no on HP-UX 10 and older.
839 hpux*) gl_cv_func_printf_flag_leftadjust="guessing no";;
840 # Guess yes otherwise.
841 *) gl_cv_func_printf_flag_leftadjust="guessing yes";;
848 dnl Test whether the *printf family of functions supports padding of non-finite
849 dnl values with the 0 flag correctly. (ISO C99 + TC1 + TC2.) See
850 dnl <http://lists.gnu.org/archive/html/bug-gnulib/2007-04/msg00107.html>
851 dnl Result is gl_cv_func_printf_flag_zero.
853 AC_DEFUN([gl_PRINTF_FLAG_ZERO],
855 AC_REQUIRE([AC_PROG_CC])
856 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
857 AC_CACHE_CHECK([whether printf supports the zero flag correctly],
858 [gl_cv_func_printf_flag_zero],
864 static char buf[100];
867 if (sprintf (buf, "%010f", 1.0 / 0.0, 33, 44, 55) < 0
868 || (strcmp (buf, " inf") != 0
869 && strcmp (buf, " infinity") != 0))
873 [gl_cv_func_printf_flag_zero=yes],
874 [gl_cv_func_printf_flag_zero=no],
878 # Guess yes on glibc systems.
879 *-gnu*) gl_cv_func_printf_flag_zero="guessing yes";;
881 beos*) gl_cv_func_printf_flag_zero="guessing yes";;
882 # If we don't know, assume the worst.
883 *) gl_cv_func_printf_flag_zero="guessing no";;
890 dnl Test whether the *printf family of functions supports large precisions.
891 dnl On mingw, precisions larger than 512 are treated like 512, in integer,
892 dnl floating-point or pointer output. On Solaris 10/x86, precisions larger
893 dnl than 510 in floating-point output crash the program. On Solaris 10/SPARC,
894 dnl precisions larger than 510 in floating-point output yield wrong results.
895 dnl On AIX 7.1, precisions larger than 998 in floating-point output yield
896 dnl wrong results. On BeOS, precisions larger than 1044 crash the program.
897 dnl Result is gl_cv_func_printf_precision.
899 AC_DEFUN([gl_PRINTF_PRECISION],
901 AC_REQUIRE([AC_PROG_CC])
902 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
903 AC_CACHE_CHECK([whether printf supports large precisions],
904 [gl_cv_func_printf_precision],
910 static char buf[5000];
915 /* On BeOS, this would crash and show a dialog box. Avoid the crash. */
918 if (sprintf (buf, "%.4000d %d", 1, 33, 44) < 4000 + 3)
920 if (sprintf (buf, "%.4000f %d", 1.0, 33, 44) < 4000 + 5)
922 if (sprintf (buf, "%.511f %d", 1.0, 33, 44) < 511 + 5
925 if (sprintf (buf, "%.999f %d", 1.0, 33, 44) < 999 + 5
930 [gl_cv_func_printf_precision=yes],
931 [gl_cv_func_printf_precision=no],
935 # Guess no only on Solaris, native Win32, and BeOS systems.
936 solaris*) gl_cv_func_printf_precision="guessing no" ;;
937 mingw* | pw*) gl_cv_func_printf_precision="guessing no" ;;
938 beos*) gl_cv_func_printf_precision="guessing no" ;;
939 *) gl_cv_func_printf_precision="guessing yes" ;;
946 dnl Test whether the *printf family of functions recovers gracefully in case
947 dnl of an out-of-memory condition, or whether it crashes the entire program.
948 dnl Result is gl_cv_func_printf_enomem.
950 AC_DEFUN([gl_PRINTF_ENOMEM],
952 AC_REQUIRE([AC_PROG_CC])
953 AC_REQUIRE([gl_MULTIARCH])
954 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
955 AC_CACHE_CHECK([whether printf survives out-of-memory conditions],
956 [gl_cv_func_printf_enomem],
958 gl_cv_func_printf_enomem="guessing no"
959 if test "$cross_compiling" = no; then
960 if test $APPLE_UNIVERSAL_BUILD = 0; then
961 AC_LANG_CONFTEST([AC_LANG_SOURCE([
965 #include <sys/types.h>
966 #include <sys/time.h>
967 #include <sys/resource.h>
974 /* Some printf implementations allocate temporary space with malloc. */
975 /* On BSD systems, malloc() is limited by RLIMIT_DATA. */
977 if (getrlimit (RLIMIT_DATA, &limit) < 0)
979 if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000)
980 limit.rlim_max = 5000000;
981 limit.rlim_cur = limit.rlim_max;
982 if (setrlimit (RLIMIT_DATA, &limit) < 0)
985 /* On Linux systems, malloc() is limited by RLIMIT_AS. */
987 if (getrlimit (RLIMIT_AS, &limit) < 0)
989 if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000)
990 limit.rlim_max = 5000000;
991 limit.rlim_cur = limit.rlim_max;
992 if (setrlimit (RLIMIT_AS, &limit) < 0)
995 /* Some printf implementations allocate temporary space on the stack. */
997 if (getrlimit (RLIMIT_STACK, &limit) < 0)
999 if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000)
1000 limit.rlim_max = 5000000;
1001 limit.rlim_cur = limit.rlim_max;
1002 if (setrlimit (RLIMIT_STACK, &limit) < 0)
1005 ret = printf ("%.5000000f", 1.0);
1006 return !(ret == 5000002 || (ret < 0 && errno == ENOMEM));
1010 if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
1013 if test $result != 0 && test $result != 77; then result=1; fi
1015 ) >/dev/null 2>/dev/null
1017 0) gl_cv_func_printf_enomem="yes" ;;
1018 77) gl_cv_func_printf_enomem="guessing no" ;;
1019 *) gl_cv_func_printf_enomem="no" ;;
1022 gl_cv_func_printf_enomem="guessing no"
1026 dnl A universal build on Apple MacOS X platforms.
1027 dnl The result would be 'no' in 32-bit mode and 'yes' in 64-bit mode.
1028 dnl But we need a configuration result that is valid in both modes.
1029 gl_cv_func_printf_enomem="guessing no"
1032 if test "$gl_cv_func_printf_enomem" = "guessing no"; then
1035 # Guess yes on glibc systems.
1036 *-gnu*) gl_cv_func_printf_enomem="guessing yes";;
1037 # Guess yes on Solaris.
1038 solaris*) gl_cv_func_printf_enomem="guessing yes";;
1040 aix*) gl_cv_func_printf_enomem="guessing yes";;
1041 # Guess yes on HP-UX/hppa.
1042 hpux*) case "$host_cpu" in
1043 hppa*) gl_cv_func_printf_enomem="guessing yes";;
1044 *) gl_cv_func_printf_enomem="guessing no";;
1047 # Guess yes on IRIX.
1048 irix*) gl_cv_func_printf_enomem="guessing yes";;
1049 # Guess yes on OSF/1.
1050 osf*) gl_cv_func_printf_enomem="guessing yes";;
1051 # Guess yes on BeOS.
1052 beos*) gl_cv_func_printf_enomem="guessing yes";;
1053 # Guess yes on Haiku.
1054 haiku*) gl_cv_func_printf_enomem="guessing yes";;
1055 # If we don't know, assume the worst.
1056 *) gl_cv_func_printf_enomem="guessing no";;
1063 dnl Test whether the snprintf function exists. (ISO C99, POSIX:2001)
1064 dnl Result is ac_cv_func_snprintf.
1066 AC_DEFUN([gl_SNPRINTF_PRESENCE],
1068 AC_CHECK_FUNCS_ONCE([snprintf])
1071 dnl Test whether the string produced by the snprintf function is always NUL
1072 dnl terminated. (ISO C99, POSIX:2001)
1073 dnl Result is gl_cv_func_snprintf_truncation_c99.
1075 AC_DEFUN([gl_SNPRINTF_TRUNCATION_C99],
1077 AC_REQUIRE([AC_PROG_CC])
1078 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
1079 AC_CACHE_CHECK([whether snprintf truncates the result as in C99],
1080 [gl_cv_func_snprintf_truncation_c99],
1086 static char buf[100];
1089 strcpy (buf, "ABCDEF");
1090 snprintf (buf, 3, "%d %d", 4567, 89);
1091 if (memcmp (buf, "45\0DEF", 6) != 0)
1095 [gl_cv_func_snprintf_truncation_c99=yes],
1096 [gl_cv_func_snprintf_truncation_c99=no],
1100 # Guess yes on glibc systems.
1101 *-gnu*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1102 # Guess yes on FreeBSD >= 5.
1103 freebsd[1-4]*) gl_cv_func_snprintf_truncation_c99="guessing no";;
1104 freebsd* | kfreebsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1105 # Guess yes on MacOS X >= 10.3.
1106 darwin[1-6].*) gl_cv_func_snprintf_truncation_c99="guessing no";;
1107 darwin*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1108 # Guess yes on OpenBSD >= 3.9.
1109 openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
1110 gl_cv_func_snprintf_truncation_c99="guessing no";;
1111 openbsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1112 # Guess yes on Solaris >= 2.6.
1113 solaris2.[0-5] | solaris2.[0-5].*)
1114 gl_cv_func_snprintf_truncation_c99="guessing no";;
1115 solaris*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1116 # Guess yes on AIX >= 4.
1117 aix[1-3]*) gl_cv_func_snprintf_truncation_c99="guessing no";;
1118 aix*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1119 # Guess yes on HP-UX >= 11.
1120 hpux[7-9]* | hpux10*) gl_cv_func_snprintf_truncation_c99="guessing no";;
1121 hpux*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1122 # Guess yes on IRIX >= 6.5.
1123 irix6.5) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1124 # Guess yes on OSF/1 >= 5.
1125 osf[3-4]*) gl_cv_func_snprintf_truncation_c99="guessing no";;
1126 osf*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1127 # Guess yes on NetBSD >= 3.
1128 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
1129 gl_cv_func_snprintf_truncation_c99="guessing no";;
1130 netbsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1131 # Guess yes on BeOS.
1132 beos*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1133 # If we don't know, assume the worst.
1134 *) gl_cv_func_snprintf_truncation_c99="guessing no";;
1141 dnl Test whether the return value of the snprintf function is the number
1142 dnl of bytes (excluding the terminating NUL) that would have been produced
1143 dnl if the buffer had been large enough. (ISO C99, POSIX:2001)
1144 dnl For example, this test program fails on IRIX 6.5:
1145 dnl ---------------------------------------------------------------------
1146 dnl #include <stdio.h>
1149 dnl static char buf[8];
1150 dnl int retval = snprintf (buf, 3, "%d", 12345);
1151 dnl return retval >= 0 && retval < 3;
1153 dnl ---------------------------------------------------------------------
1154 dnl Result is gl_cv_func_snprintf_retval_c99.
1156 AC_DEFUN_ONCE([gl_SNPRINTF_RETVAL_C99],
1158 AC_REQUIRE([AC_PROG_CC])
1159 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
1160 AC_CACHE_CHECK([whether snprintf returns a byte count as in C99],
1161 [gl_cv_func_snprintf_retval_c99],
1167 static char buf[100];
1170 strcpy (buf, "ABCDEF");
1171 if (snprintf (buf, 3, "%d %d", 4567, 89) != 7)
1173 if (snprintf (buf, 0, "%d %d", 4567, 89) != 7)
1175 if (snprintf (NULL, 0, "%d %d", 4567, 89) != 7)
1179 [gl_cv_func_snprintf_retval_c99=yes],
1180 [gl_cv_func_snprintf_retval_c99=no],
1184 # Guess yes on glibc systems.
1185 *-gnu*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1186 # Guess yes on FreeBSD >= 5.
1187 freebsd[1-4]*) gl_cv_func_snprintf_retval_c99="guessing no";;
1188 freebsd* | kfreebsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1189 # Guess yes on MacOS X >= 10.3.
1190 darwin[1-6].*) gl_cv_func_snprintf_retval_c99="guessing no";;
1191 darwin*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1192 # Guess yes on OpenBSD >= 3.9.
1193 openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
1194 gl_cv_func_snprintf_retval_c99="guessing no";;
1195 openbsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1196 # Guess yes on Solaris >= 2.10.
1197 solaris2.[1-9][0-9]*) gl_cv_func_printf_sizes_c99="guessing yes";;
1198 solaris*) gl_cv_func_printf_sizes_c99="guessing no";;
1199 # Guess yes on AIX >= 4.
1200 aix[1-3]*) gl_cv_func_snprintf_retval_c99="guessing no";;
1201 aix*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1202 # Guess yes on NetBSD >= 3.
1203 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
1204 gl_cv_func_snprintf_retval_c99="guessing no";;
1205 netbsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1206 # Guess yes on BeOS.
1207 beos*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1208 # If we don't know, assume the worst.
1209 *) gl_cv_func_snprintf_retval_c99="guessing no";;
1216 dnl Test whether the snprintf function supports the %n format directive
1217 dnl also in truncated portions of the format string. (ISO C99, POSIX:2001)
1218 dnl Result is gl_cv_func_snprintf_directive_n.
1220 AC_DEFUN([gl_SNPRINTF_DIRECTIVE_N],
1222 AC_REQUIRE([AC_PROG_CC])
1223 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
1224 AC_CACHE_CHECK([whether snprintf fully supports the 'n' directive],
1225 [gl_cv_func_snprintf_directive_n],
1231 static char fmtstring[10];
1232 static char buf[100];
1236 /* Copy the format string. Some systems (glibc with _FORTIFY_SOURCE=2)
1237 support %n in format strings in read-only memory but not in writable
1239 strcpy (fmtstring, "%d %n");
1240 snprintf (buf, 4, fmtstring, 12345, &count, 33, 44, 55);
1245 [gl_cv_func_snprintf_directive_n=yes],
1246 [gl_cv_func_snprintf_directive_n=no],
1250 # Guess yes on glibc systems.
1251 *-gnu*) gl_cv_func_snprintf_directive_n="guessing yes";;
1252 # Guess yes on FreeBSD >= 5.
1253 freebsd[1-4]*) gl_cv_func_snprintf_directive_n="guessing no";;
1254 freebsd* | kfreebsd*) gl_cv_func_snprintf_directive_n="guessing yes";;
1255 # Guess yes on MacOS X >= 10.3.
1256 darwin[1-6].*) gl_cv_func_snprintf_directive_n="guessing no";;
1257 darwin*) gl_cv_func_snprintf_directive_n="guessing yes";;
1258 # Guess yes on Solaris >= 2.6.
1259 solaris2.[0-5] | solaris2.[0-5].*)
1260 gl_cv_func_snprintf_directive_n="guessing no";;
1261 solaris*) gl_cv_func_snprintf_directive_n="guessing yes";;
1262 # Guess yes on AIX >= 4.
1263 aix[1-3]*) gl_cv_func_snprintf_directive_n="guessing no";;
1264 aix*) gl_cv_func_snprintf_directive_n="guessing yes";;
1265 # Guess yes on IRIX >= 6.5.
1266 irix6.5) gl_cv_func_snprintf_directive_n="guessing yes";;
1267 # Guess yes on OSF/1 >= 5.
1268 osf[3-4]*) gl_cv_func_snprintf_directive_n="guessing no";;
1269 osf*) gl_cv_func_snprintf_directive_n="guessing yes";;
1270 # Guess yes on NetBSD >= 3.
1271 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
1272 gl_cv_func_snprintf_directive_n="guessing no";;
1273 netbsd*) gl_cv_func_snprintf_directive_n="guessing yes";;
1274 # Guess yes on BeOS.
1275 beos*) gl_cv_func_snprintf_directive_n="guessing yes";;
1276 # If we don't know, assume the worst.
1277 *) gl_cv_func_snprintf_directive_n="guessing no";;
1284 dnl Test whether the snprintf function, when passed a size = 1, writes any
1285 dnl output without bounds in this case, behaving like sprintf. This is the
1286 dnl case on Linux libc5.
1287 dnl Result is gl_cv_func_snprintf_size1.
1289 AC_DEFUN([gl_SNPRINTF_SIZE1],
1291 AC_REQUIRE([AC_PROG_CC])
1292 AC_CACHE_CHECK([whether snprintf respects a size of 1],
1293 [gl_cv_func_snprintf_size1],
1300 static char buf[8] = { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F' };
1301 snprintf (buf, 1, "%d", 12345);
1302 return buf[1] != 'E';
1304 [gl_cv_func_snprintf_size1=yes],
1305 [gl_cv_func_snprintf_size1=no],
1306 [gl_cv_func_snprintf_size1="guessing yes"])
1310 dnl Test whether the vsnprintf function, when passed a zero size, produces no
1311 dnl output. (ISO C99, POSIX:2001)
1312 dnl For example, snprintf nevertheless writes a NUL byte in this case
1314 dnl ---------------------------------------------------------------------
1315 dnl #include <stdio.h>
1318 dnl static char buf[8] = { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F' };
1319 dnl snprintf (buf, 0, "%d", 12345);
1320 dnl return buf[0] != 'D';
1322 dnl ---------------------------------------------------------------------
1323 dnl And vsnprintf writes any output without bounds in this case, behaving like
1324 dnl vsprintf, on HP-UX 11 and OSF/1 5.1:
1325 dnl ---------------------------------------------------------------------
1326 dnl #include <stdarg.h>
1327 dnl #include <stdio.h>
1328 dnl static int my_snprintf (char *buf, int size, const char *format, ...)
1332 dnl va_start (args, format);
1333 dnl ret = vsnprintf (buf, size, format, args);
1339 dnl static char buf[8] = { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F' };
1340 dnl my_snprintf (buf, 0, "%d", 12345);
1341 dnl return buf[0] != 'D';
1343 dnl ---------------------------------------------------------------------
1344 dnl Result is gl_cv_func_vsnprintf_zerosize_c99.
1346 AC_DEFUN([gl_VSNPRINTF_ZEROSIZE_C99],
1348 AC_REQUIRE([AC_PROG_CC])
1349 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
1350 AC_CACHE_CHECK([whether vsnprintf respects a zero size as in C99],
1351 [gl_cv_func_vsnprintf_zerosize_c99],
1357 static int my_snprintf (char *buf, int size, const char *format, ...)
1361 va_start (args, format);
1362 ret = vsnprintf (buf, size, format, args);
1368 static char buf[8] = { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F' };
1369 my_snprintf (buf, 0, "%d", 12345);
1370 return buf[0] != 'D';
1372 [gl_cv_func_vsnprintf_zerosize_c99=yes],
1373 [gl_cv_func_vsnprintf_zerosize_c99=no],
1377 # Guess yes on glibc systems.
1378 *-gnu*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1379 # Guess yes on FreeBSD >= 5.
1380 freebsd[1-4]*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1381 freebsd* | kfreebsd*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1382 # Guess yes on MacOS X >= 10.3.
1383 darwin[1-6].*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1384 darwin*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1385 # Guess yes on Cygwin.
1386 cygwin*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1387 # Guess yes on Solaris >= 2.6.
1388 solaris2.[0-5] | solaris2.[0-5].*)
1389 gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1390 solaris*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1391 # Guess yes on AIX >= 4.
1392 aix[1-3]*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1393 aix*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1394 # Guess yes on IRIX >= 6.5.
1395 irix6.5) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1396 # Guess yes on NetBSD >= 3.
1397 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
1398 gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1399 netbsd*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1400 # Guess yes on BeOS.
1401 beos*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1402 # Guess yes on mingw.
1403 mingw* | pw*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1404 # If we don't know, assume the worst.
1405 *) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1412 dnl The results of these tests on various platforms are:
1414 dnl 1 = gl_PRINTF_SIZES_C99
1415 dnl 2 = gl_PRINTF_LONG_DOUBLE
1416 dnl 3 = gl_PRINTF_INFINITE
1417 dnl 4 = gl_PRINTF_INFINITE_LONG_DOUBLE
1418 dnl 5 = gl_PRINTF_DIRECTIVE_A
1419 dnl 6 = gl_PRINTF_DIRECTIVE_F
1420 dnl 7 = gl_PRINTF_DIRECTIVE_N
1421 dnl 8 = gl_PRINTF_DIRECTIVE_LS
1422 dnl 9 = gl_PRINTF_POSITIONS
1423 dnl 10 = gl_PRINTF_FLAG_GROUPING
1424 dnl 11 = gl_PRINTF_FLAG_LEFTADJUST
1425 dnl 12 = gl_PRINTF_FLAG_ZERO
1426 dnl 13 = gl_PRINTF_PRECISION
1427 dnl 14 = gl_PRINTF_ENOMEM
1428 dnl 15 = gl_SNPRINTF_PRESENCE
1429 dnl 16 = gl_SNPRINTF_TRUNCATION_C99
1430 dnl 17 = gl_SNPRINTF_RETVAL_C99
1431 dnl 18 = gl_SNPRINTF_DIRECTIVE_N
1432 dnl 19 = gl_SNPRINTF_SIZE1
1433 dnl 20 = gl_VSNPRINTF_ZEROSIZE_C99
1435 dnl 1 = checking whether printf supports size specifiers as in C99...
1436 dnl 2 = checking whether printf supports 'long double' arguments...
1437 dnl 3 = checking whether printf supports infinite 'double' arguments...
1438 dnl 4 = checking whether printf supports infinite 'long double' arguments...
1439 dnl 5 = checking whether printf supports the 'a' and 'A' directives...
1440 dnl 6 = checking whether printf supports the 'F' directive...
1441 dnl 7 = checking whether printf supports the 'n' directive...
1442 dnl 8 = checking whether printf supports the 'ls' directive...
1443 dnl 9 = checking whether printf supports POSIX/XSI format strings with positions...
1444 dnl 10 = checking whether printf supports the grouping flag...
1445 dnl 11 = checking whether printf supports the left-adjust flag correctly...
1446 dnl 12 = checking whether printf supports the zero flag correctly...
1447 dnl 13 = checking whether printf supports large precisions...
1448 dnl 14 = checking whether printf survives out-of-memory conditions...
1449 dnl 15 = checking for snprintf...
1450 dnl 16 = checking whether snprintf truncates the result as in C99...
1451 dnl 17 = checking whether snprintf returns a byte count as in C99...
1452 dnl 18 = checking whether snprintf fully supports the 'n' directive...
1453 dnl 19 = checking whether snprintf respects a size of 1...
1454 dnl 20 = checking whether vsnprintf respects a zero size as in C99...
1456 dnl . = yes, # = no.
1458 dnl 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
1459 dnl glibc 2.5 . . . . . . . . . . . . . . . . . . . .
1460 dnl glibc 2.3.6 . . . . # . . . . . . . . . . . . . . .
1461 dnl FreeBSD 5.4, 6.1 . . . . # . . . . . . # . # . . . . . .
1462 dnl MacOS X 10.5.8 . . . # # . . . . . . # . . . . . . . .
1463 dnl MacOS X 10.3.9 . . . . # . . . . . . # . # . . . . . .
1464 dnl OpenBSD 3.9, 4.0 . . # # # # . # . # . # . # . . . . . .
1465 dnl Cygwin 1.7.0 (2009) . . . # . . . ? . . . . . ? . . . . . .
1466 dnl Cygwin 1.5.25 (2008) . . . # # . . # . . . . . # . . . . . .
1467 dnl Cygwin 1.5.19 (2006) # . . # # # . # . # . # # # . . . . . .
1468 dnl Solaris 11 2010-11 . . # # # . . # . . . # . . . . . . . .
1469 dnl Solaris 10 . . # # # . . # . . . # # . . . . . . .
1470 dnl Solaris 2.6 ... 9 # . # # # # . # . . . # # . . . # . . .
1471 dnl Solaris 2.5.1 # . # # # # . # . . . # . . # # # # # #
1472 dnl AIX 7.1 . . # # # . . . . . . # # . . . . . . .
1473 dnl AIX 5.2 . . # # # . . . . . . # . . . . . . . .
1474 dnl AIX 4.3.2, 5.1 # . # # # # . . . . . # . . . . # . . .
1475 dnl HP-UX 11.31 . . . . # . . . . . . # . . . . # # . .
1476 dnl HP-UX 11.{00,11,23} # . . . # # . . . . . # . . . . # # . #
1477 dnl HP-UX 10.20 # . # . # # . ? . . # # . . . . # # ? #
1478 dnl IRIX 6.5 # . # # # # . # . . . # . . . . # . . .
1479 dnl OSF/1 5.1 # . # # # # . . . . . # . . . . # . . #
1480 dnl OSF/1 4.0d # . # # # # . . . . . # . . # # # # # #
1481 dnl NetBSD 5.0 . . . # # . . . . . . # . # . . . . . .
1482 dnl NetBSD 4.0 . ? ? ? ? ? . ? . ? ? ? ? ? . . . ? ? ?
1483 dnl NetBSD 3.0 . . . . # # . ? # # ? # . # . . . . . .
1484 dnl Haiku . . . # # # . # . . . . . ? . . ? . . .
1485 dnl BeOS # # . # # # . ? # . ? . # ? . . ? . . .
1486 dnl old mingw / msvcrt # # # # # # . . # # . # # ? . # # # . .
1487 dnl mingw 2009-2011 . # . # . . . . # # . . . ? . . . . . .
1488 dnl mingw-w64 2011 # # # # # # . . # # . # # ? . # # # . .