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 memcpy (dest, src, n);
169 memcpy (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 /* Initializes ST inside pool POOL (which may be a null pointer) with
199 initial contents S. */
201 ds_create (struct pool *pool, struct string *st, const char *s)
204 st->length = strlen (s);
205 st->size = 8 + st->length * 2;
206 st->string = pool_malloc (pool, st->size + 1);
207 strcpy (st->string, s);
210 /* Initializes ST inside POOL (which may be null), making room for at
211 least SIZE characters. */
213 ds_init (struct pool *pool, struct string *st, size_t size)
221 st->string = pool_malloc (pool, st->size + 1);
224 /* Replaces the contents of ST with STRING. STRING may overlap with
227 ds_replace (struct string *st, const char *string)
229 char *s = st->string;
231 ds_create (st->pool, st, string);
232 pool_free (st->pool, s);
237 ds_destroy (struct string *st)
239 pool_free (st->pool, st->string);
242 /* Truncates ST to zero length. */
244 ds_clear (struct string *st)
249 /* Ensures that ST can hold at least MIN_SIZE characters plus a null
252 ds_extend (struct string *st, size_t min_size)
254 if (min_size > st->size)
257 if (st->size < min_size)
258 st->size = min_size * 2;
260 st->string = pool_realloc (st->pool, st->string, st->size + 1);
264 /* Shrink ST to the minimum size need to contain its content. */
266 ds_shrink (struct string *st)
268 if (st->size != st->length)
270 st->size = st->length;
271 st->string = pool_realloc (st->pool, st->string, st->size + 1);
275 /* Truncates ST to at most LENGTH characters long. */
277 ds_truncate (struct string *st, size_t length)
279 if (length >= st->length)
284 /* Returns the length of ST. */
286 ds_length (const struct string *st)
291 /* Returns the allocation size of ST. */
293 ds_size (const struct string *st)
298 /* Returns the value of ST as a null-terminated string. */
300 ds_value (const struct string *st)
302 ((char *) st->string)[st->length] = '\0';
306 /* Returns a pointer to the null terminator ST.
307 This might not be an actual null character unless ds_value() has
308 been called since the last modification to ST. */
310 ds_end (const struct string *st)
312 return st->string + st->length;
315 /* Concatenates S onto ST. */
317 ds_concat (struct string *st, const char *s)
324 ds_extend (st, st->length + s_len);
325 strcpy (st->string + st->length, s);
329 /* Concatenates LEN characters from BUF onto ST. */
331 ds_concat_buffer (struct string *st, const char *buf, size_t len)
333 ds_extend (st, st->length + len);
334 memcpy (st->string + st->length, buf, len);
338 void ds_vprintf (struct string *st, const char *format, va_list args);
341 /* Formats FORMAT as a printf string and appends the result to ST. */
343 ds_printf (struct string *st, const char *format, ...)
347 va_start (args, format);
348 ds_vprintf(st,format,args);
353 /* Formats FORMAT as a printf string and appends the result to ST. */
355 ds_vprintf (struct string *st, const char *format, va_list args)
357 /* Fscking glibc silently changed behavior between 2.0 and 2.1.
358 Fsck fsck fsck. Before, it returned -1 on buffer overflow. Now,
359 it returns the number of characters (not bytes) that would have
364 avail = st->size - st->length + 1;
365 needed = vsnprintf (st->string + st->length, avail, format, args);
370 ds_extend (st, st->length + needed);
372 vsprintf (st->string + st->length, format, args);
377 ds_extend (st, (st->size + 1) * 2);
378 avail = st->size - st->length + 1;
380 needed = vsnprintf (st->string + st->length, avail, format, args);
384 st->length += needed;
387 /* Appends character CH to ST. */
389 ds_putchar (struct string *st, int ch)
391 if (st->length == st->size)
392 ds_extend (st, st->length + 1);
393 st->string[st->length++] = ch;
396 /* Reads a newline-terminated line from STREAM into ST.
397 Newline is the last character of ST on return, unless an I/O error
398 or end of file is encountered after reading some characters.
399 Returns 1 if a line is successfully read, or 0 if no characters at
400 all were read before an I/O error or end of file was
403 ds_getline (struct string *st, FILE *stream)
423 /* Reads a line from STREAM into ST, then preprocesses as follows:
425 - Splices lines terminated with `\'.
427 - Deletes comments introduced by `#' outside of single or double
430 - Trailing whitespace will be deleted.
432 Increments cust_ln as appropriate.
434 Returns nonzero only if a line was successfully read. */
436 ds_get_config_line (FILE *stream, struct string *st, struct file_locator *where)
438 /* Read the first line. */
440 where->line_number++;
441 if (!ds_getline (st, stream))
444 /* Read additional lines, if any. */
447 /* Remove trailing whitespace. */
449 char *s = ds_value (st);
450 size_t len = ds_length (st);
452 while (len > 0 && isspace ((unsigned char) s[len - 1]))
454 ds_truncate (st, len);
457 /* Check for trailing \. Remove if found, bail otherwise. */
458 if (ds_length (st) == 0 || ds_value (st)[ds_length (st) - 1] != '\\')
460 ds_truncate (st, ds_length (st) - 1);
462 /* Append another line and go around again. */
464 int success = ds_getline (st, stream);
465 where->line_number++;
471 /* Find a comment and remove. */
476 for (cp = ds_value (st); *cp; cp++)
481 else if (*cp == '\\')
484 else if (*cp == '\'' || *cp == '"')
488 ds_truncate (st, cp - ds_value (st));
496 /* Lengthed strings. */
498 /* Creates a new lengthed string LS in POOL with contents as a copy of
501 ls_create (struct pool *pool, struct len_string *ls, const char *s)
503 ls->length = strlen (s);
504 ls->string = pool_alloc (pool, ls->length + 1);
505 memcpy (ls->string, s, ls->length + 1);
508 /* Creates a new lengthed string LS in POOL with contents as a copy of
509 BUFFER with length LEN. */
511 ls_create_buffer (struct pool *pool, struct len_string *ls,
512 const char *buffer, size_t len)
515 ls->string = pool_malloc (pool, len + 1);
516 memcpy (ls->string, buffer, len);
517 ls->string[len] = '\0';
520 /* Sets the fields of LS to the specified values. */
522 ls_init (struct len_string *ls, const char *string, size_t length)
524 ls->string = (char *) string;
528 /* Copies the fields of SRC to DST. */
530 ls_shallow_copy (struct len_string *dst, const struct len_string *src)
535 /* Frees the memory in POOL backing LS. */
537 ls_destroy (struct pool *pool, struct len_string *ls)
539 pool_free (pool, ls->string);
542 /* Sets LS to a null pointer value. */
544 ls_null (struct len_string *ls)
549 /* Returns nonzero only if LS has a null pointer value. */
551 ls_null_p (const struct len_string *ls)
553 return ls->string == NULL;
556 /* Returns nonzero only if LS is a null pointer or has length 0. */
558 ls_empty_p (const struct len_string *ls)
560 return ls->string == NULL || ls->length == 0;
563 /* Returns the length of LS, which must not be null. */
565 ls_length (const struct len_string *ls)
570 /* Returns a pointer to the character string in LS. */
572 ls_value (const struct len_string *ls)
574 return (char *) ls->string;
577 /* Returns a pointer to the null terminator of the character string in
580 ls_end (const struct len_string *ls)
582 return (char *) (ls->string + ls->length);