2 dnl Copyright (C) 2003, 2007 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],
24 #include <sys/types.h>
25 #if HAVE_STDINT_H_WITH_UINTMAX
28 #if HAVE_INTTYPES_H_WITH_UINTMAX
29 # include <inttypes.h>
34 #if HAVE_STDINT_H_WITH_UINTMAX || HAVE_INTTYPES_H_WITH_UINTMAX
36 if (sprintf (buf, "%ju %d", (uintmax_t) 12345671, 33, 44, 55) < 0
37 || strcmp (buf, "12345671 33") != 0)
41 if (sprintf (buf, "%zu %d", (size_t) 12345672, 33, 44, 55) < 0
42 || strcmp (buf, "12345672 33") != 0)
45 if (sprintf (buf, "%tu %d", (ptrdiff_t) 12345673, 33, 44, 55) < 0
46 || strcmp (buf, "12345673 33") != 0)
49 if (sprintf (buf, "%Lg %d", (long double) 1.5, 33, 44, 55) < 0
50 || strcmp (buf, "1.5 33") != 0)
53 }], [gl_cv_func_printf_sizes_c99=yes], [gl_cv_func_printf_sizes_c99=no],
57 # Guess yes on glibc systems.
58 *-gnu*) gl_cv_func_printf_sizes_c99="guessing yes";;
59 # Guess yes on FreeBSD >= 5.
60 freebsd[1-4]*) gl_cv_func_printf_sizes_c99="guessing no";;
61 freebsd* | kfreebsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
62 # Guess yes on MacOS X >= 10.3.
63 darwin[1-6].*) gl_cv_func_printf_sizes_c99="guessing no";;
64 darwin*) gl_cv_func_printf_sizes_c99="guessing yes";;
65 # Guess yes on OpenBSD >= 3.9.
66 openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
67 gl_cv_func_printf_sizes_c99="guessing no";;
68 openbsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
69 # Guess yes on Solaris >= 2.10.
70 solaris2.[0-9]*) gl_cv_func_printf_sizes_c99="guessing no";;
71 solaris*) gl_cv_func_printf_sizes_c99="guessing yes";;
72 # Guess yes on NetBSD >= 3.
73 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
74 gl_cv_func_printf_sizes_c99="guessing no";;
75 netbsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
76 # If we don't know, assume the worst.
77 *) gl_cv_func_printf_sizes_c99="guessing no";;
84 dnl Test whether the *printf family of functions supports 'long double'
85 dnl arguments together with the 'L' size specifier. (ISO C99, POSIX:2001)
86 dnl Result is gl_cv_func_printf_long_double.
88 AC_DEFUN([gl_PRINTF_LONG_DOUBLE],
90 AC_REQUIRE([AC_PROG_CC])
91 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
92 AC_CACHE_CHECK([whether printf supports 'long double' arguments],
93 [gl_cv_func_printf_long_double],
98 static char buf[10000];
102 if (sprintf (buf, "%Lf %d", 1.75L, 33, 44, 55) < 0
103 || strcmp (buf, "1.750000 33") != 0)
106 if (sprintf (buf, "%Le %d", 1.75L, 33, 44, 55) < 0
107 || strcmp (buf, "1.750000e+00 33") != 0)
110 if (sprintf (buf, "%Lg %d", 1.75L, 33, 44, 55) < 0
111 || strcmp (buf, "1.75 33") != 0)
114 }], [gl_cv_func_printf_long_double=yes], [gl_cv_func_printf_long_double=no],
118 beos*) gl_cv_func_printf_long_double="guessing no";;
119 mingw* | pw*) gl_cv_func_printf_long_double="guessing no";;
120 *) gl_cv_func_printf_long_double="guessing yes";;
127 dnl Test whether the *printf family of functions supports infinite and NaN
128 dnl 'double' arguments in the %f, %e, %g directives. (ISO C99, POSIX:2001)
129 dnl Result is gl_cv_func_printf_infinite.
131 AC_DEFUN([gl_PRINTF_INFINITE],
133 AC_REQUIRE([AC_PROG_CC])
134 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
135 AC_CACHE_CHECK([whether printf supports infinite 'double' arguments],
136 [gl_cv_func_printf_infinite],
142 strisnan (const char *string, size_t start_index, size_t end_index)
144 if (start_index < end_index)
146 if (string[start_index] == '-')
148 if (start_index + 3 <= end_index
149 && memcmp (string + start_index, "nan", 3) == 0)
152 if (start_index == end_index
153 || (string[start_index] == '(' && string[end_index - 1] == ')'))
159 static char buf[10000];
160 static double zero = 0.0;
163 if (sprintf (buf, "%f", 1.0 / 0.0) < 0
164 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
166 if (sprintf (buf, "%f", -1.0 / 0.0) < 0
167 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
169 if (sprintf (buf, "%f", zero / zero) < 0
170 || !strisnan (buf, 0, strlen (buf)))
172 if (sprintf (buf, "%e", 1.0 / 0.0) < 0
173 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
175 if (sprintf (buf, "%e", -1.0 / 0.0) < 0
176 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
178 if (sprintf (buf, "%e", zero / zero) < 0
179 || !strisnan (buf, 0, strlen (buf)))
181 if (sprintf (buf, "%g", 1.0 / 0.0) < 0
182 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
184 if (sprintf (buf, "%g", -1.0 / 0.0) < 0
185 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
187 if (sprintf (buf, "%g", zero / zero) < 0
188 || !strisnan (buf, 0, strlen (buf)))
191 }], [gl_cv_func_printf_infinite=yes], [gl_cv_func_printf_infinite=no],
195 # Guess yes on glibc systems.
196 *-gnu*) gl_cv_func_printf_infinite="guessing yes";;
197 # Guess yes on FreeBSD >= 6.
198 freebsd[1-5]*) gl_cv_func_printf_infinite="guessing no";;
199 freebsd* | kfreebsd*) gl_cv_func_printf_infinite="guessing yes";;
200 # Guess yes on MacOS X >= 10.3.
201 darwin[1-6].*) gl_cv_func_printf_infinite="guessing no";;
202 darwin*) gl_cv_func_printf_infinite="guessing yes";;
203 # Guess yes on HP-UX >= 11.
204 hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite="guessing no";;
205 hpux*) gl_cv_func_printf_infinite="guessing yes";;
206 # Guess yes on NetBSD >= 3.
207 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
208 gl_cv_func_printf_infinite="guessing no";;
209 netbsd*) gl_cv_func_printf_infinite="guessing yes";;
211 beos*) gl_cv_func_printf_infinite="guessing yes";;
212 # If we don't know, assume the worst.
213 *) gl_cv_func_printf_infinite="guessing no";;
220 dnl Test whether the *printf family of functions supports infinite and NaN
221 dnl 'long double' arguments in the %f, %e, %g directives. (ISO C99, POSIX:2001)
222 dnl Result is gl_cv_func_printf_infinite_long_double.
224 AC_DEFUN([gl_PRINTF_INFINITE_LONG_DOUBLE],
226 AC_REQUIRE([gl_PRINTF_LONG_DOUBLE])
227 AC_REQUIRE([AC_PROG_CC])
228 AC_REQUIRE([AC_C_BIGENDIAN])
229 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
230 dnl The user can set or unset the variable gl_printf_safe to indicate
231 dnl that he wishes a safe handling of non-IEEE-754 'long double' values.
232 if test -n "$gl_printf_safe"; then
233 AC_DEFINE([CHECK_PRINTF_SAFE], 1,
234 [Define if you wish *printf() functions that have a safe handling of
235 non-IEEE-754 'long double' values.])
237 case "$gl_cv_func_printf_long_double" in
239 AC_CACHE_CHECK([whether printf supports infinite 'long double' arguments],
240 [gl_cv_func_printf_infinite_long_double],
248 strisnan (const char *string, size_t start_index, size_t end_index)
250 if (start_index < end_index)
252 if (string[start_index] == '-')
254 if (start_index + 3 <= end_index
255 && memcmp (string + start_index, "nan", 3) == 0)
258 if (start_index == end_index
259 || (string[start_index] == '(' && string[end_index - 1] == ')'))
265 static char buf[10000];
266 static long double zeroL = 0.0L;
270 if (sprintf (buf, "%Lf", 1.0L / 0.0L) < 0
271 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
273 if (sprintf (buf, "%Lf", -1.0L / 0.0L) < 0
274 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
276 if (sprintf (buf, "%Lf", zeroL / zeroL) < 0
277 || !strisnan (buf, 0, strlen (buf)))
279 if (sprintf (buf, "%Le", 1.0L / 0.0L) < 0
280 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
282 if (sprintf (buf, "%Le", -1.0L / 0.0L) < 0
283 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
285 if (sprintf (buf, "%Le", zeroL / zeroL) < 0
286 || !strisnan (buf, 0, strlen (buf)))
288 if (sprintf (buf, "%Lg", 1.0L / 0.0L) < 0
289 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
291 if (sprintf (buf, "%Lg", -1.0L / 0.0L) < 0
292 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
294 if (sprintf (buf, "%Lg", zeroL / zeroL) < 0
295 || !strisnan (buf, 0, strlen (buf)))
297 #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_))
298 /* Representation of an 80-bit 'long double' as an initializer for a sequence
299 of 'unsigned int' words. */
300 # ifdef WORDS_BIGENDIAN
301 # define LDBL80_WORDS(exponent,manthi,mantlo) \
302 { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
303 ((unsigned int) (manthi) << 16) | (unsigned int) (mantlo) >> 16), \
304 (unsigned int) (mantlo) << 16 \
307 # define LDBL80_WORDS(exponent,manthi,mantlo) \
308 { mantlo, manthi, exponent }
311 static union { unsigned int word[4]; long double value; } x =
312 { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
313 if (sprintf (buf, "%Lf", x.value) < 0
314 || !strisnan (buf, 0, strlen (buf)))
316 if (sprintf (buf, "%Le", x.value) < 0
317 || !strisnan (buf, 0, strlen (buf)))
319 if (sprintf (buf, "%Lg", x.value) < 0
320 || !strisnan (buf, 0, strlen (buf)))
324 /* Signalling NaN. */
325 static union { unsigned int word[4]; long double value; } x =
326 { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
327 if (sprintf (buf, "%Lf", x.value) < 0
328 || !strisnan (buf, 0, strlen (buf)))
330 if (sprintf (buf, "%Le", x.value) < 0
331 || !strisnan (buf, 0, strlen (buf)))
333 if (sprintf (buf, "%Lg", x.value) < 0
334 || !strisnan (buf, 0, strlen (buf)))
338 static union { unsigned int word[4]; long double value; } x =
339 { LDBL80_WORDS (0xFFFF, 0x40000001, 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)))
350 { /* Pseudo-Infinity. */
351 static union { unsigned int word[4]; long double value; } x =
352 { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
353 if (sprintf (buf, "%Lf", x.value) < 0
354 || !strisnan (buf, 0, strlen (buf)))
356 if (sprintf (buf, "%Le", x.value) < 0
357 || !strisnan (buf, 0, strlen (buf)))
359 if (sprintf (buf, "%Lg", x.value) < 0
360 || !strisnan (buf, 0, strlen (buf)))
364 static union { unsigned int word[4]; long double value; } x =
365 { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
366 if (sprintf (buf, "%Lf", x.value) < 0
367 || !strisnan (buf, 0, strlen (buf)))
369 if (sprintf (buf, "%Le", x.value) < 0
370 || !strisnan (buf, 0, strlen (buf)))
372 if (sprintf (buf, "%Lg", x.value) < 0
373 || !strisnan (buf, 0, strlen (buf)))
376 { /* Unnormalized number. */
377 static union { unsigned int word[4]; long double value; } x =
378 { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
379 if (sprintf (buf, "%Lf", x.value) < 0
380 || !strisnan (buf, 0, strlen (buf)))
382 if (sprintf (buf, "%Le", x.value) < 0
383 || !strisnan (buf, 0, strlen (buf)))
385 if (sprintf (buf, "%Lg", x.value) < 0
386 || !strisnan (buf, 0, strlen (buf)))
389 { /* Pseudo-Denormal. */
390 static union { unsigned int word[4]; long double value; } x =
391 { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
392 if (sprintf (buf, "%Lf", x.value) < 0
393 || !strisnan (buf, 0, strlen (buf)))
395 if (sprintf (buf, "%Le", x.value) < 0
396 || !strisnan (buf, 0, strlen (buf)))
398 if (sprintf (buf, "%Lg", x.value) < 0
399 || !strisnan (buf, 0, strlen (buf)))
405 [gl_cv_func_printf_infinite_long_double=yes],
406 [gl_cv_func_printf_infinite_long_double=no],
410 # Guess no on ia64, x86_64, i386.
411 ia64 | x86_64 | i*86) gl_cv_func_printf_infinite_long_double="guessing no";;
414 # Guess yes on glibc systems.
415 *-gnu*) gl_cv_func_printf_infinite_long_double="guessing yes";;
416 # Guess yes on FreeBSD >= 6.
417 freebsd[1-5]*) gl_cv_func_printf_infinite_long_double="guessing no";;
418 freebsd* | kfreebsd*) gl_cv_func_printf_infinite_long_double="guessing yes";;
419 # Guess yes on MacOS X >= 10.3.
420 darwin[1-6].*) gl_cv_func_printf_infinite_long_double="guessing no";;
421 darwin*) gl_cv_func_printf_infinite_long_double="guessing yes";;
422 # Guess yes on HP-UX >= 11.
423 hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite_long_double="guessing no";;
424 hpux*) gl_cv_func_printf_infinite_long_double="guessing yes";;
425 # Guess yes on NetBSD >= 3.
426 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
427 gl_cv_func_printf_infinite_long_double="guessing no";;
428 netbsd*) gl_cv_func_printf_infinite_long_double="guessing yes";;
429 # If we don't know, assume the worst.
430 *) gl_cv_func_printf_infinite_long_double="guessing no";;
439 gl_cv_func_printf_infinite_long_double="irrelevant"
444 dnl Test whether the *printf family of functions supports the 'a' and 'A'
445 dnl conversion specifier for hexadecimal output of floating-point numbers.
446 dnl (ISO C99, POSIX:2001)
447 dnl Result is gl_cv_func_printf_directive_a.
449 AC_DEFUN([gl_PRINTF_DIRECTIVE_A],
451 AC_REQUIRE([AC_PROG_CC])
452 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
453 AC_CACHE_CHECK([whether printf supports the 'a' and 'A' directives],
454 [gl_cv_func_printf_directive_a],
459 static char buf[100];
462 if (sprintf (buf, "%a %d", 3.1416015625, 33, 44, 55) < 0
463 || (strcmp (buf, "0x1.922p+1 33") != 0
464 && strcmp (buf, "0x3.244p+0 33") != 0
465 && strcmp (buf, "0x6.488p-1 33") != 0
466 && strcmp (buf, "0xc.91p-2 33") != 0))
468 if (sprintf (buf, "%A %d", -3.1416015625, 33, 44, 55) < 0
469 || (strcmp (buf, "-0X1.922P+1 33") != 0
470 && strcmp (buf, "-0X3.244P+0 33") != 0
471 && strcmp (buf, "-0X6.488P-1 33") != 0
472 && strcmp (buf, "-0XC.91P-2 33") != 0))
474 /* This catches a FreeBSD 6.1 bug: it doesn't round. */
475 if (sprintf (buf, "%.2a %d", 1.51, 33, 44, 55) < 0
476 || (strcmp (buf, "0x1.83p+0 33") != 0
477 && strcmp (buf, "0x3.05p-1 33") != 0
478 && strcmp (buf, "0x6.0ap-2 33") != 0
479 && strcmp (buf, "0xc.14p-3 33") != 0))
481 /* This catches a FreeBSD 6.1 bug. See
482 <http://lists.gnu.org/archive/html/bug-gnulib/2007-04/msg00107.html> */
483 if (sprintf (buf, "%010a %d", 1.0 / 0.0, 33, 44, 55) < 0
486 /* This catches a MacOS X 10.3.9 (Darwin 7.9) bug. */
487 if (sprintf (buf, "%.1a", 1.999) < 0
488 || (strcmp (buf, "0x1.0p+1") != 0
489 && strcmp (buf, "0x2.0p+0") != 0
490 && strcmp (buf, "0x4.0p-1") != 0
491 && strcmp (buf, "0x8.0p-2") != 0))
493 /* This catches the same MacOS X 10.3.9 (Darwin 7.9) bug and also a
494 glibc 2.4 bug <http://sourceware.org/bugzilla/show_bug.cgi?id=2908>. */
495 if (sprintf (buf, "%.1La", 1.999L) < 0
496 || (strcmp (buf, "0x1.0p+1") != 0
497 && strcmp (buf, "0x2.0p+0") != 0
498 && strcmp (buf, "0x4.0p-1") != 0
499 && strcmp (buf, "0x8.0p-2") != 0))
502 }], [gl_cv_func_printf_directive_a=yes], [gl_cv_func_printf_directive_a=no],
505 # Guess yes on glibc >= 2.5 systems.
507 AC_EGREP_CPP([BZ2908], [
508 #include <features.h>
509 #ifdef __GNU_LIBRARY__
510 #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 5) || (__GLIBC__ > 2)
515 [gl_cv_func_printf_directive_a="guessing yes"],
516 [gl_cv_func_printf_directive_a="guessing no"])
518 # If we don't know, assume the worst.
519 *) gl_cv_func_printf_directive_a="guessing no";;
525 dnl Test whether the *printf family of functions supports the %F format
526 dnl directive. (ISO C99, POSIX:2001)
527 dnl Result is gl_cv_func_printf_directive_f.
529 AC_DEFUN([gl_PRINTF_DIRECTIVE_F],
531 AC_REQUIRE([AC_PROG_CC])
532 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
533 AC_CACHE_CHECK([whether printf supports the 'F' directive],
534 [gl_cv_func_printf_directive_f],
539 static char buf[100];
542 if (sprintf (buf, "%F %d", 1234567.0, 33, 44, 55) < 0
543 || strcmp (buf, "1234567.000000 33") != 0)
545 if (sprintf (buf, "%F", 1.0 / 0.0) < 0
546 || (strcmp (buf, "INF") != 0 && strcmp (buf, "INFINITY") != 0))
548 /* This catches a Cygwin 2007 bug. */
549 if (sprintf (buf, "%.F", 1234.0) < 0
550 || strcmp (buf, "1234") != 0)
553 }], [gl_cv_func_printf_directive_f=yes], [gl_cv_func_printf_directive_f=no],
557 # Guess yes on glibc systems.
558 *-gnu*) gl_cv_func_printf_directive_f="guessing yes";;
559 # Guess yes on FreeBSD >= 6.
560 freebsd[1-5]*) gl_cv_func_printf_directive_f="guessing no";;
561 freebsd* | kfreebsd*) gl_cv_func_printf_directive_f="guessing yes";;
562 # Guess yes on MacOS X >= 10.3.
563 darwin[1-6].*) gl_cv_func_printf_directive_f="guessing no";;
564 darwin*) gl_cv_func_printf_directive_f="guessing yes";;
565 # Guess yes on Solaris >= 2.10.
566 solaris2.[0-9]*) gl_cv_func_printf_directive_f="guessing no";;
567 solaris*) gl_cv_func_printf_directive_f="guessing yes";;
568 # If we don't know, assume the worst.
569 *) gl_cv_func_printf_directive_f="guessing no";;
576 dnl Test whether the *printf family of functions supports the %n format
577 dnl directive. (ISO C99, POSIX:2001)
578 dnl Result is gl_cv_func_printf_directive_n.
580 AC_DEFUN([gl_PRINTF_DIRECTIVE_N],
582 AC_REQUIRE([AC_PROG_CC])
583 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
584 AC_CACHE_CHECK([whether printf supports the 'n' directive],
585 [gl_cv_func_printf_directive_n],
590 static char fmtstring[10];
591 static char buf[100];
595 /* Copy the format string. Some systems (glibc with _FORTIFY_SOURCE=2)
596 support %n in format strings in read-only memory but not in writable
598 strcpy (fmtstring, "%d %n");
599 if (sprintf (buf, fmtstring, 123, &count, 33, 44, 55) < 0
600 || strcmp (buf, "123 ") != 0
604 }], [gl_cv_func_printf_directive_n=yes], [gl_cv_func_printf_directive_n=no],
608 *) gl_cv_func_printf_directive_n="guessing yes";;
615 dnl Test whether the *printf family of functions supports POSIX/XSI format
616 dnl strings with positions. (POSIX:2001)
617 dnl Result is gl_cv_func_printf_positions.
619 AC_DEFUN([gl_PRINTF_POSITIONS],
621 AC_REQUIRE([AC_PROG_CC])
622 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
623 AC_CACHE_CHECK([whether printf supports POSIX/XSI format strings with positions],
624 [gl_cv_func_printf_positions],
629 /* The string "%2$d %1$d", with dollar characters protected from the shell's
630 dollar expansion (possibly an autoconf bug). */
631 static char format[] = { '%', '2', '$', 'd', ' ', '%', '1', '$', 'd', '\0' };
632 static char buf[100];
635 sprintf (buf, format, 33, 55);
636 return (strcmp (buf, "55 33") != 0);
637 }], [gl_cv_func_printf_positions=yes], [gl_cv_func_printf_positions=no],
641 netbsd[1-3]* | netbsdelf[1-3]* | netbsdaout[1-3]* | netbsdcoff[1-3]*)
642 gl_cv_func_printf_positions="guessing no";;
643 beos*) gl_cv_func_printf_positions="guessing no";;
644 mingw* | pw*) gl_cv_func_printf_positions="guessing no";;
645 *) gl_cv_func_printf_positions="guessing yes";;
652 dnl Test whether the *printf family of functions supports POSIX/XSI format
653 dnl strings with the ' flag for grouping of decimal digits. (POSIX:2001)
654 dnl Result is gl_cv_func_printf_flag_grouping.
656 AC_DEFUN([gl_PRINTF_FLAG_GROUPING],
658 AC_REQUIRE([AC_PROG_CC])
659 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
660 AC_CACHE_CHECK([whether printf supports the grouping flag],
661 [gl_cv_func_printf_flag_grouping],
666 static char buf[100];
669 if (sprintf (buf, "%'d %d", 1234567, 99) < 0
670 || buf[strlen (buf) - 1] != '9')
673 }], [gl_cv_func_printf_flag_grouping=yes], [gl_cv_func_printf_flag_grouping=no],
677 cygwin*) gl_cv_func_printf_flag_grouping="guessing no";;
678 netbsd*) gl_cv_func_printf_flag_grouping="guessing no";;
679 mingw* | pw*) gl_cv_func_printf_flag_grouping="guessing no";;
680 *) gl_cv_func_printf_flag_grouping="guessing yes";;
687 dnl Test whether the *printf family of functions supports padding of non-finite
688 dnl values with the 0 flag correctly. (ISO C99 + TC1 + TC2.) See
689 dnl <http://lists.gnu.org/archive/html/bug-gnulib/2007-04/msg00107.html>
690 dnl Result is gl_cv_func_printf_flag_zero.
692 AC_DEFUN([gl_PRINTF_FLAG_ZERO],
694 AC_REQUIRE([AC_PROG_CC])
695 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
696 AC_CACHE_CHECK([whether printf supports the zero flag correctly],
697 [gl_cv_func_printf_flag_zero],
702 static char buf[100];
705 if (sprintf (buf, "%010f", 1.0 / 0.0, 33, 44, 55) < 0
706 || (strcmp (buf, " inf") != 0
707 && strcmp (buf, " infinity") != 0))
710 }], [gl_cv_func_printf_flag_zero=yes], [gl_cv_func_printf_flag_zero=no],
714 # Guess yes on glibc systems.
715 *-gnu*) gl_cv_func_printf_flag_zero="guessing yes";;
717 beos*) gl_cv_func_printf_flag_zero="guessing yes";;
718 # If we don't know, assume the worst.
719 *) gl_cv_func_printf_flag_zero="guessing no";;
726 dnl Test whether the *printf family of functions supports large precisions.
727 dnl On mingw, precisions larger than 512 are treated like 512, in integer,
728 dnl floating-point or pointer output. On BeOS, precisions larger than 1044
729 dnl crash the program.
730 dnl Result is gl_cv_func_printf_precision.
732 AC_DEFUN([gl_PRINTF_PRECISION],
734 AC_REQUIRE([AC_PROG_CC])
735 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
736 AC_CACHE_CHECK([whether printf supports large precisions],
737 [gl_cv_func_printf_precision],
742 static char buf[5000];
746 /* On BeOS, this would crash and show a dialog box. Avoid the crash. */
749 if (sprintf (buf, "%.4000d %d", 1, 33, 44) < 4000 + 3)
752 }], [gl_cv_func_printf_precision=yes], [gl_cv_func_printf_precision=no],
756 # Guess no only on native Win32 and BeOS systems.
757 mingw* | pw*) gl_cv_func_printf_precision="guessing no" ;;
758 beos*) gl_cv_func_printf_precision="guessing no" ;;
759 *) gl_cv_func_printf_precision="guessing yes" ;;
766 dnl Test whether the *printf family of functions recovers gracefully in case
767 dnl of an out-of-memory condition, or whether it crashes the entire program.
768 dnl Result is gl_cv_func_printf_enomem.
770 AC_DEFUN([gl_PRINTF_ENOMEM],
772 AC_REQUIRE([AC_PROG_CC])
773 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
774 AC_CACHE_CHECK([whether printf survives out-of-memory conditions],
775 [gl_cv_func_printf_enomem],
777 if test "$cross_compiling" = no; then
778 AC_LANG_CONFTEST([AC_LANG_SOURCE([
782 #include <sys/types.h>
783 #include <sys/time.h>
784 #include <sys/resource.h>
791 /* Some printf implementations allocate temporary space with malloc. */
792 /* On BSD systems, malloc() is limited by RLIMIT_DATA. */
794 if (getrlimit (RLIMIT_DATA, &limit) < 0)
796 if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000)
797 limit.rlim_max = 5000000;
798 limit.rlim_cur = limit.rlim_max;
799 if (setrlimit (RLIMIT_DATA, &limit) < 0)
802 /* On Linux systems, malloc() is limited by RLIMIT_AS. */
804 if (getrlimit (RLIMIT_AS, &limit) < 0)
806 if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000)
807 limit.rlim_max = 5000000;
808 limit.rlim_cur = limit.rlim_max;
809 if (setrlimit (RLIMIT_AS, &limit) < 0)
812 /* Some printf implementations allocate temporary space on the stack. */
814 if (getrlimit (RLIMIT_STACK, &limit) < 0)
816 if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000)
817 limit.rlim_max = 5000000;
818 limit.rlim_cur = limit.rlim_max;
819 if (setrlimit (RLIMIT_STACK, &limit) < 0)
822 ret = printf ("%.5000000f", 1.0);
823 return !(ret == 5000002 || (ret < 0 && errno == ENOMEM));
827 if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
830 if test $result != 0 && test $result != 77; then result=1; fi
832 ) >/dev/null 2>/dev/null
834 0) gl_cv_func_printf_enomem="yes" ;;
835 77) gl_cv_func_printf_enomem="guessing no" ;;
836 *) gl_cv_func_printf_enomem="no" ;;
839 gl_cv_func_printf_enomem="guessing no"
845 # Guess yes on glibc systems.
846 *-gnu*) gl_cv_func_printf_enomem="guessing yes";;
847 # Guess yes on Solaris.
848 solaris*) gl_cv_func_printf_enomem="guessing yes";;
850 aix*) gl_cv_func_printf_enomem="guessing yes";;
851 # Guess yes on HP-UX/hppa.
852 hpux*) case "$host_cpu" in
853 hppa*) gl_cv_func_printf_enomem="guessing yes";;
854 *) gl_cv_func_printf_enomem="guessing no";;
858 irix*) gl_cv_func_printf_enomem="guessing yes";;
859 # Guess yes on OSF/1.
860 osf*) gl_cv_func_printf_enomem="guessing yes";;
862 beos*) gl_cv_func_printf_enomem="guessing yes";;
863 # If we don't know, assume the worst.
864 *) gl_cv_func_printf_enomem="guessing no";;
871 dnl Test whether the snprintf function exists. (ISO C99, POSIX:2001)
872 dnl Result is ac_cv_func_snprintf.
874 AC_DEFUN([gl_SNPRINTF_PRESENCE],
876 AC_CHECK_FUNCS_ONCE([snprintf])
879 dnl Test whether the string produced by the snprintf function is always NUL
880 dnl terminated. (ISO C99, POSIX:2001)
881 dnl Result is gl_cv_func_snprintf_truncation_c99.
883 AC_DEFUN([gl_SNPRINTF_TRUNCATION_C99],
885 AC_REQUIRE([AC_PROG_CC])
886 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
887 AC_CACHE_CHECK([whether snprintf truncates the result as in C99],
888 [gl_cv_func_snprintf_truncation_c99],
893 static char buf[100];
896 strcpy (buf, "ABCDEF");
897 snprintf (buf, 3, "%d %d", 4567, 89);
898 if (memcmp (buf, "45\0DEF", 6) != 0)
901 }], [gl_cv_func_snprintf_truncation_c99=yes], [gl_cv_func_snprintf_truncation_c99=no],
905 # Guess yes on glibc systems.
906 *-gnu*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
907 # Guess yes on FreeBSD >= 5.
908 freebsd[1-4]*) gl_cv_func_snprintf_truncation_c99="guessing no";;
909 freebsd* | kfreebsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
910 # Guess yes on MacOS X >= 10.3.
911 darwin[1-6].*) gl_cv_func_snprintf_truncation_c99="guessing no";;
912 darwin*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
913 # Guess yes on OpenBSD >= 3.9.
914 openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
915 gl_cv_func_snprintf_truncation_c99="guessing no";;
916 openbsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
917 # Guess yes on Solaris >= 2.6.
918 solaris2.[0-5]*) gl_cv_func_snprintf_truncation_c99="guessing no";;
919 solaris*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
920 # Guess yes on AIX >= 4.
921 aix[1-3]*) gl_cv_func_snprintf_truncation_c99="guessing no";;
922 aix*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
923 # Guess yes on HP-UX >= 11.
924 hpux[7-9]* | hpux10*) gl_cv_func_snprintf_truncation_c99="guessing no";;
925 hpux*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
926 # Guess yes on IRIX >= 6.5.
927 irix6.5) gl_cv_func_snprintf_truncation_c99="guessing yes";;
928 # Guess yes on OSF/1 >= 5.
929 osf[3-4]*) gl_cv_func_snprintf_truncation_c99="guessing no";;
930 osf*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
931 # Guess yes on NetBSD >= 3.
932 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
933 gl_cv_func_snprintf_truncation_c99="guessing no";;
934 netbsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
936 beos*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
937 # If we don't know, assume the worst.
938 *) gl_cv_func_snprintf_truncation_c99="guessing no";;
945 dnl Test whether the return value of the snprintf function is the number
946 dnl of bytes (excluding the terminating NUL) that would have been produced
947 dnl if the buffer had been large enough. (ISO C99, POSIX:2001)
948 dnl For example, this test program fails on IRIX 6.5:
949 dnl ---------------------------------------------------------------------
950 dnl #include <stdio.h>
953 dnl static char buf[8];
954 dnl int retval = snprintf (buf, 3, "%d", 12345);
955 dnl return retval >= 0 && retval < 3;
957 dnl ---------------------------------------------------------------------
958 dnl Result is gl_cv_func_snprintf_retval_c99.
960 AC_DEFUN([gl_SNPRINTF_RETVAL_C99],
962 AC_REQUIRE([AC_PROG_CC])
963 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
964 AC_CACHE_CHECK([whether snprintf returns a byte count as in C99],
965 [gl_cv_func_snprintf_retval_c99],
970 static char buf[100];
973 strcpy (buf, "ABCDEF");
974 if (snprintf (buf, 3, "%d %d", 4567, 89) != 7)
977 }], [gl_cv_func_snprintf_retval_c99=yes], [gl_cv_func_snprintf_retval_c99=no],
981 # Guess yes on glibc systems.
982 *-gnu*) gl_cv_func_snprintf_retval_c99="guessing yes";;
983 # Guess yes on FreeBSD >= 5.
984 freebsd[1-4]*) gl_cv_func_snprintf_retval_c99="guessing no";;
985 freebsd* | kfreebsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
986 # Guess yes on MacOS X >= 10.3.
987 darwin[1-6].*) gl_cv_func_snprintf_retval_c99="guessing no";;
988 darwin*) gl_cv_func_snprintf_retval_c99="guessing yes";;
989 # Guess yes on OpenBSD >= 3.9.
990 openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
991 gl_cv_func_snprintf_retval_c99="guessing no";;
992 openbsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
993 # Guess yes on Solaris >= 2.6.
994 solaris2.[0-5]*) gl_cv_func_snprintf_retval_c99="guessing no";;
995 solaris*) gl_cv_func_snprintf_retval_c99="guessing yes";;
996 # Guess yes on AIX >= 4.
997 aix[1-3]*) gl_cv_func_snprintf_retval_c99="guessing no";;
998 aix*) gl_cv_func_snprintf_retval_c99="guessing yes";;
999 # Guess yes on NetBSD >= 3.
1000 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
1001 gl_cv_func_snprintf_retval_c99="guessing no";;
1002 netbsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1003 # Guess yes on BeOS.
1004 beos*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1005 # If we don't know, assume the worst.
1006 *) gl_cv_func_snprintf_retval_c99="guessing no";;
1013 dnl Test whether the snprintf function supports the %n format directive
1014 dnl also in truncated portions of the format string. (ISO C99, POSIX:2001)
1015 dnl Result is gl_cv_func_snprintf_directive_n.
1017 AC_DEFUN([gl_SNPRINTF_DIRECTIVE_N],
1019 AC_REQUIRE([AC_PROG_CC])
1020 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
1021 AC_CACHE_CHECK([whether snprintf fully supports the 'n' directive],
1022 [gl_cv_func_snprintf_directive_n],
1027 static char fmtstring[10];
1028 static char buf[100];
1032 /* Copy the format string. Some systems (glibc with _FORTIFY_SOURCE=2)
1033 support %n in format strings in read-only memory but not in writable
1035 strcpy (fmtstring, "%d %n");
1036 snprintf (buf, 4, fmtstring, 12345, &count, 33, 44, 55);
1040 }], [gl_cv_func_snprintf_directive_n=yes], [gl_cv_func_snprintf_directive_n=no],
1044 # Guess yes on glibc systems.
1045 *-gnu*) gl_cv_func_snprintf_directive_n="guessing yes";;
1046 # Guess yes on FreeBSD >= 5.
1047 freebsd[1-4]*) gl_cv_func_snprintf_directive_n="guessing no";;
1048 freebsd* | kfreebsd*) gl_cv_func_snprintf_directive_n="guessing yes";;
1049 # Guess yes on MacOS X >= 10.3.
1050 darwin[1-6].*) gl_cv_func_snprintf_directive_n="guessing no";;
1051 darwin*) gl_cv_func_snprintf_directive_n="guessing yes";;
1052 # Guess yes on Solaris >= 2.6.
1053 solaris2.[0-5]*) gl_cv_func_snprintf_directive_n="guessing no";;
1054 solaris*) gl_cv_func_snprintf_directive_n="guessing yes";;
1055 # Guess yes on AIX >= 4.
1056 aix[1-3]*) gl_cv_func_snprintf_directive_n="guessing no";;
1057 aix*) gl_cv_func_snprintf_directive_n="guessing yes";;
1058 # Guess yes on IRIX >= 6.5.
1059 irix6.5) gl_cv_func_snprintf_directive_n="guessing yes";;
1060 # Guess yes on OSF/1 >= 5.
1061 osf[3-4]*) gl_cv_func_snprintf_directive_n="guessing no";;
1062 osf*) gl_cv_func_snprintf_directive_n="guessing yes";;
1063 # Guess yes on NetBSD >= 3.
1064 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
1065 gl_cv_func_snprintf_directive_n="guessing no";;
1066 netbsd*) gl_cv_func_snprintf_directive_n="guessing yes";;
1067 # Guess yes on BeOS.
1068 beos*) gl_cv_func_snprintf_directive_n="guessing yes";;
1069 # If we don't know, assume the worst.
1070 *) gl_cv_func_snprintf_directive_n="guessing no";;
1077 dnl Test whether the vsnprintf function, when passed a zero size, produces no
1078 dnl output. (ISO C99, POSIX:2001)
1079 dnl For example, snprintf nevertheless writes a NUL byte in this case
1081 dnl ---------------------------------------------------------------------
1082 dnl #include <stdio.h>
1085 dnl static char buf[8] = "DEADBEEF";
1086 dnl snprintf (buf, 0, "%d", 12345);
1087 dnl return buf[0] != 'D';
1089 dnl ---------------------------------------------------------------------
1090 dnl And vsnprintf writes any output without bounds in this case, behaving like
1091 dnl vsprintf, on HP-UX 11 and OSF/1 5.1:
1092 dnl ---------------------------------------------------------------------
1093 dnl #include <stdarg.h>
1094 dnl #include <stdio.h>
1095 dnl static int my_snprintf (char *buf, int size, const char *format, ...)
1099 dnl va_start (args, format);
1100 dnl ret = vsnprintf (buf, size, format, args);
1106 dnl static char buf[8] = "DEADBEEF";
1107 dnl my_snprintf (buf, 0, "%d", 12345);
1108 dnl return buf[0] != 'D';
1110 dnl ---------------------------------------------------------------------
1111 dnl Result is gl_cv_func_vsnprintf_zerosize_c99.
1113 AC_DEFUN([gl_VSNPRINTF_ZEROSIZE_C99],
1115 AC_REQUIRE([AC_PROG_CC])
1116 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
1117 AC_CACHE_CHECK([whether vsnprintf respects a zero size as in C99],
1118 [gl_cv_func_vsnprintf_zerosize_c99],
1123 static int my_snprintf (char *buf, int size, const char *format, ...)
1127 va_start (args, format);
1128 ret = vsnprintf (buf, size, format, args);
1134 static char buf[8] = "DEADBEEF";
1135 my_snprintf (buf, 0, "%d", 12345);
1136 return buf[0] != 'D';
1138 [gl_cv_func_vsnprintf_zerosize_c99=yes],
1139 [gl_cv_func_vsnprintf_zerosize_c99=no],
1143 # Guess yes on glibc systems.
1144 *-gnu*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1145 # Guess yes on FreeBSD >= 5.
1146 freebsd[1-4]*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1147 freebsd* | kfreebsd*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1148 # Guess yes on MacOS X >= 10.3.
1149 darwin[1-6].*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1150 darwin*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1151 # Guess yes on Cygwin.
1152 cygwin*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1153 # Guess yes on Solaris >= 2.6.
1154 solaris2.[0-5]*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1155 solaris*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1156 # Guess yes on AIX >= 4.
1157 aix[1-3]*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1158 aix*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1159 # Guess yes on IRIX >= 6.5.
1160 irix6.5) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1161 # Guess yes on NetBSD >= 3.
1162 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
1163 gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1164 netbsd*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1165 # Guess yes on BeOS.
1166 beos*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1167 # Guess yes on mingw.
1168 mingw* | pw*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1169 # If we don't know, assume the worst.
1170 *) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1177 dnl The results of these tests on various platforms are:
1179 dnl 1 = gl_PRINTF_SIZES_C99
1180 dnl 2 = gl_PRINTF_LONG_DOUBLE
1181 dnl 3 = gl_PRINTF_INFINITE
1182 dnl 4 = gl_PRINTF_INFINITE_LONG_DOUBLE
1183 dnl 5 = gl_PRINTF_DIRECTIVE_A
1184 dnl 6 = gl_PRINTF_DIRECTIVE_F
1185 dnl 7 = gl_PRINTF_DIRECTIVE_N
1186 dnl 8 = gl_PRINTF_POSITIONS
1187 dnl 9 = gl_PRINTF_FLAG_GROUPING
1188 dnl 10 = gl_PRINTF_FLAG_ZERO
1189 dnl 11 = gl_PRINTF_PRECISION
1190 dnl 12 = gl_PRINTF_ENOMEM
1191 dnl 13 = gl_SNPRINTF_PRESENCE
1192 dnl 14 = gl_SNPRINTF_TRUNCATION_C99
1193 dnl 15 = gl_SNPRINTF_RETVAL_C99
1194 dnl 16 = gl_SNPRINTF_DIRECTIVE_N
1195 dnl 17 = gl_VSNPRINTF_ZEROSIZE_C99
1197 dnl 1 = checking whether printf supports size specifiers as in C99...
1198 dnl 2 = checking whether printf supports 'long double' arguments...
1199 dnl 3 = checking whether printf supports infinite 'double' arguments...
1200 dnl 4 = checking whether printf supports infinite 'long double' arguments...
1201 dnl 5 = checking whether printf supports the 'a' and 'A' directives...
1202 dnl 6 = checking whether printf supports the 'F' directive...
1203 dnl 7 = checking whether printf supports the 'n' directive...
1204 dnl 8 = checking whether printf supports POSIX/XSI format strings with positions...
1205 dnl 9 = checking whether printf supports the grouping flag...
1206 dnl 10 = checking whether printf supports the zero flag correctly...
1207 dnl 11 = checking whether printf supports large precisions...
1208 dnl 12 = checking whether printf survives out-of-memory conditions...
1209 dnl 13 = checking for snprintf...
1210 dnl 14 = checking whether snprintf truncates the result as in C99...
1211 dnl 15 = checking whether snprintf returns a byte count as in C99...
1212 dnl 16 = checking whether snprintf fully supports the 'n' directive...
1213 dnl 17 = checking whether vsnprintf respects a zero size as in C99...
1215 dnl . = yes, # = no.
1217 dnl 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
1218 dnl glibc 2.5 . . . . . . . . . . . . . . . . .
1219 dnl glibc 2.3.6 . . . . # . . . . . . . . . . . .
1220 dnl FreeBSD 5.4, 6.1 . . . . # . . . . # . # . . . . .
1221 dnl MacOS X 10.3.9 . . . . # . . . . # . # . . . . .
1222 dnl OpenBSD 3.9, 4.0 . ? ? ? # ? . . ? ? ? ? . . . ? ?
1223 dnl Cygwin 2007 (= Cygwin 1.5.24) . . . . # # . . . # ? ? . . . . .
1224 dnl Cygwin 2006 (= Cygwin 1.5.19) # . . . # # . . # # ? ? . . . . .
1225 dnl Solaris 10 . . # # # . . . . # . . . . . . .
1226 dnl Solaris 2.6 ... 9 # . # # # # . . . # . . . . . . .
1227 dnl Solaris 2.5.1 # . # # # # . . . # . . # # # # #
1228 dnl AIX 5.2 . . # # # . . . . # . . . . . . .
1229 dnl AIX 4.3.2, 5.1 # . # # # # . . . # . . . . . . .
1230 dnl HP-UX 11.31 . . . . # . . . . # . . . . # # .
1231 dnl HP-UX 10.20, 11.{00,11,23} # . . . # # . . . # . . . . # # #
1232 dnl IRIX 6.5 # . # # # # . . . # . . . . # . .
1233 dnl OSF/1 5.1 # . # # # # . . . # . . . . # . #
1234 dnl OSF/1 4.0d # . # # # # . . . # . . # # # # #
1235 dnl NetBSD 4.0 . ? ? ? ? ? . . ? ? ? ? . . . ? ?
1236 dnl NetBSD 3.0 . . . . # # . # # # . # . . . . .
1237 dnl BeOS # # . # # # . # . . # ? . . . . .
1238 dnl mingw # # # # # # . # # # # ? . # # # .