1 /* PSPP - computes sample statistics.
2 Copyright (C) 1997-9, 2000 Free Software Foundation, Inc.
3 Written by Ben Pfaff <blp@gnu.org>.
5 This program is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 This program is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
30 /* sprintf() wrapper functions for convenience. */
34 spprintf (char *buf, const char *format,...)
41 va_start (args, format);
45 vsprintf (buf, format, args);
51 return strchr (buf, 0);
54 #endif /* !__GNUC__ */
56 #if !__GNUC__ && !HAVE_GOOD_SPRINTF
58 nsprintf (char *buf, const char *format,...)
62 va_start (args, format);
63 vsprintf (buf, format, args);
70 nvsprintf (char *buf, const char *format, va_list args)
72 vsprintf (buf, format, args);
75 #endif /* Not GNU C and not good sprintf(). */
77 /* Reverses the order of NBYTES bytes at address P, thus converting
78 between little- and big-endian byte orders. */
80 mm_reverse (void *p, size_t nbytes)
82 unsigned char *h = p, *t = &h[nbytes - 1];
94 /* Finds the last NEEDLE of length NEEDLE_LEN in a HAYSTACK of length
95 HAYSTACK_LEN. Returns a pointer to the needle found. */
97 mm_find_reverse (const char *haystack, size_t haystack_len,
98 const char *needle, size_t needle_len)
101 for (i = haystack_len - needle_len; i >= 0; i--)
102 if (!memcmp (needle, &haystack[i], needle_len))
103 return (char *) &haystack[i];
107 /* Compares A of length A_LEN to B of length B_LEN. The shorter
108 string is considered to be padded with spaces to the length of
111 st_compare_pad (const char *a, size_t a_len, const char *b, size_t b_len)
116 min_len = a_len < b_len ? a_len : b_len;
117 result = memcmp (a, b, min_len);
126 for (idx = min_len; idx < b_len; idx++)
128 return ' ' > b[idx] ? 1 : -1;
132 for (idx = min_len; idx < a_len; idx++)
134 return a[idx] > ' ' ? 1 : -1;
140 /* Copies SRC to DEST, truncating to N characters or right-padding
141 with spaces to N characters as necessary. Does not append a null
142 character. SRC must be null-terminated. */
144 st_bare_pad_copy (char *dest, const char *src, size_t n)
150 memcpy (dest, src, n);
153 memcpy (dest, src, len);
154 memset (&dest[len], ' ', n - len);
158 /* Copies SRC to DEST, truncating SRC to N characters or right-padding
159 with spaces to N characters if necessary. Does not append a null
160 character. SRC must be LEN characters long but does not need to be
163 st_bare_pad_len_copy (char *dest, const char *src, size_t n, size_t len)
166 memmove (dest, src, n);
169 memmove (dest, src, len);
170 memset (&dest[len], ' ', n - len);
174 /* Copies SRC to DEST, truncating SRC to N-1 characters or
175 right-padding with spaces to N-1 characters if necessary. Always
176 appends a null character. */
178 st_pad_copy (char *dest, const char *src, size_t n)
185 else if (len < n - 1)
187 memcpy (dest, src, len);
188 memset (&dest[len], ' ', n - 1 - len);
193 memcpy (dest, src, n - 1);
198 /* Copies SRC to DST, truncating DST to N-1 characters if
199 necessary. Always appends a null character. */
201 st_trim_copy (char *dst, const char *src, size_t n)
203 size_t len = strlen (src);
206 memcpy (dst, src, len + 1);
209 memcpy (dst, src, n - 1);
215 /* Converts each character in S to uppercase. */
217 st_uppercase (char *s)
219 for (; *s != '\0'; s++)
220 *s = toupper ((unsigned char) *s);
223 /* Initializes ST with initial contents S. */
225 ds_create (struct string *st, const char *s)
227 st->length = strlen (s);
228 st->capacity = 8 + st->length * 2;
229 st->string = xmalloc (st->capacity + 1);
230 strcpy (st->string, s);
233 /* Initializes ST, making room for at least CAPACITY characters. */
235 ds_init (struct string *st, size_t capacity)
239 st->capacity = capacity;
242 st->string = xmalloc (st->capacity + 1);
245 /* Replaces the contents of ST with STRING. STRING may overlap with
248 ds_replace (struct string *st, const char *string)
250 size_t new_length = strlen (string);
251 if (new_length > st->capacity)
253 /* The new length is longer than the allocated length, so
254 there can be no overlap. */
256 ds_concat (st, string, new_length);
260 /* Overlap is possible, but the new string will fit in the
261 allocated space, so we can just copy data. */
262 st->length = new_length;
263 memmove (st->string, string, st->length);
269 ds_destroy (struct string *st)
274 /* Truncates ST to zero length. */
276 ds_clear (struct string *st)
281 /* Pad ST on the right with copies of PAD until ST is at least
282 LENGTH characters in size. If ST is initially LENGTH
283 characters or longer, this is a no-op. */
285 ds_rpad (struct string *st, size_t length, char pad)
288 if (st->length < length)
290 if (st->capacity < length)
291 ds_extend (st, length);
292 memset (&st->string[st->length], pad, length - st->length);
297 /* Ensures that ST can hold at least MIN_CAPACITY characters plus a null
300 ds_extend (struct string *st, size_t min_capacity)
302 if (min_capacity > st->capacity)
305 if (st->capacity < min_capacity)
306 st->capacity = min_capacity * 2;
308 st->string = xrealloc (st->string, st->capacity + 1);
312 /* Shrink ST to the minimum capacity need to contain its content. */
314 ds_shrink (struct string *st)
316 if (st->capacity != st->length)
318 st->capacity = st->length;
319 st->string = xrealloc (st->string, st->capacity + 1);
323 /* Truncates ST to at most LENGTH characters long. */
325 ds_truncate (struct string *st, size_t length)
327 if (length >= st->length)
332 /* Returns the length of ST. */
334 ds_length (const struct string *st)
339 /* Returns the allocation size of ST. */
341 ds_capacity (const struct string *st)
346 /* Returns the value of ST as a null-terminated string. */
348 ds_c_str (const struct string *st)
350 ((char *) st->string)[st->length] = '\0';
354 /* Returns the string data inside ST. */
356 ds_data (const struct string *st)
361 /* Returns a pointer to the null terminator ST.
362 This might not be an actual null character unless ds_c_str() has
363 been called since the last modification to ST. */
365 ds_end (const struct string *st)
367 return st->string + st->length;
370 /* Concatenates S onto ST. */
372 ds_puts (struct string *st, const char *s)
379 ds_extend (st, st->length + s_len);
380 strcpy (st->string + st->length, s);
384 /* Concatenates LEN characters from BUF onto ST. */
386 ds_concat (struct string *st, const char *buf, size_t len)
388 ds_extend (st, st->length + len);
389 memcpy (st->string + st->length, buf, len);
393 void ds_vprintf (struct string *st, const char *format, va_list args);
396 /* Formats FORMAT as a printf string and appends the result to ST. */
398 ds_printf (struct string *st, const char *format, ...)
402 va_start (args, format);
403 ds_vprintf(st,format,args);
408 /* Formats FORMAT as a printf string and appends the result to ST. */
410 ds_vprintf (struct string *st, const char *format, va_list args)
412 /* Fscking glibc silently changed behavior between 2.0 and 2.1.
413 Fsck fsck fsck. Before, it returned -1 on buffer overflow. Now,
414 it returns the number of characters (not bytes) that would have
419 avail = st->capacity - st->length + 1;
420 needed = vsnprintf (st->string + st->length, avail, format, args);
425 ds_extend (st, st->length + needed);
427 vsprintf (st->string + st->length, format, args);
432 ds_extend (st, (st->capacity + 1) * 2);
433 avail = st->capacity - st->length + 1;
435 needed = vsnprintf (st->string + st->length, avail, format, args);
439 st->length += needed;
442 /* Appends character CH to ST. */
444 ds_putc (struct string *st, int ch)
446 if (st->length == st->capacity)
447 ds_extend (st, st->length + 1);
448 st->string[st->length++] = ch;
451 /* Appends to ST a newline-terminated line read from STREAM.
452 Newline is the last character of ST on return, unless an I/O error
453 or end of file is encountered after reading some characters.
454 Returns 1 if a line is successfully read, or 0 if no characters at
455 all were read before an I/O error or end of file was
458 ds_gets (struct string *st, FILE *stream)
478 /* Reads a line from STREAM into ST, then preprocesses as follows:
480 - Splices lines terminated with `\'.
482 - Deletes comments introduced by `#' outside of single or double
485 - Trailing whitespace will be deleted.
487 Increments cust_ln as appropriate.
489 Returns nonzero only if a line was successfully read. */
491 ds_get_config_line (FILE *stream, struct string *st, struct file_locator *where)
493 /* Read the first line. */
495 where->line_number++;
496 if (!ds_gets (st, stream))
499 /* Read additional lines, if any. */
502 /* Remove trailing whitespace. */
504 char *s = ds_c_str (st);
505 size_t len = ds_length (st);
507 while (len > 0 && isspace ((unsigned char) s[len - 1]))
509 ds_truncate (st, len);
512 /* Check for trailing \. Remove if found, bail otherwise. */
513 if (ds_length (st) == 0 || ds_c_str (st)[ds_length (st) - 1] != '\\')
515 ds_truncate (st, ds_length (st) - 1);
517 /* Append another line and go around again. */
519 int success = ds_gets (st, stream);
520 where->line_number++;
526 /* Find a comment and remove. */
531 for (cp = ds_c_str (st); *cp; cp++)
536 else if (*cp == '\\')
539 else if (*cp == '\'' || *cp == '"')
543 ds_truncate (st, cp - ds_c_str (st));
551 /* Lengthed strings. */
553 /* Creates a new lengthed string LS with contents as a copy of
556 ls_create (struct fixed_string *ls, const char *s)
558 ls->length = strlen (s);
559 ls->string = xmalloc (ls->length + 1);
560 memcpy (ls->string, s, ls->length + 1);
563 /* Creates a new lengthed string LS with contents as a copy of
564 BUFFER with length LEN. */
566 ls_create_buffer (struct fixed_string *ls,
567 const char *buffer, size_t len)
570 ls->string = xmalloc (len + 1);
571 memcpy (ls->string, buffer, len);
572 ls->string[len] = '\0';
575 /* Sets the fields of LS to the specified values. */
577 ls_init (struct fixed_string *ls, const char *string, size_t length)
579 ls->string = (char *) string;
583 /* Copies the fields of SRC to DST. */
585 ls_shallow_copy (struct fixed_string *dst, const struct fixed_string *src)
590 /* Frees the memory backing LS. */
592 ls_destroy (struct fixed_string *ls)
597 /* Sets LS to a null pointer value. */
599 ls_null (struct fixed_string *ls)
604 /* Returns nonzero only if LS has a null pointer value. */
606 ls_null_p (const struct fixed_string *ls)
608 return ls->string == NULL;
611 /* Returns nonzero only if LS is a null pointer or has length 0. */
613 ls_empty_p (const struct fixed_string *ls)
615 return ls->string == NULL || ls->length == 0;
618 /* Returns the length of LS, which must not be null. */
620 ls_length (const struct fixed_string *ls)
625 /* Returns a pointer to the character string in LS. */
627 ls_c_str (const struct fixed_string *ls)
629 return (char *) ls->string;
632 /* Returns a pointer to the null terminator of the character string in
635 ls_end (const struct fixed_string *ls)
637 return (char *) (ls->string + ls->length);