1 /* String intrinsics helper functions.
2 Copyright 2002, 2005, 2007 Free Software Foundation, Inc.
3 Contributed by Paul Brook <paul@nowt.org>
5 This file is part of the GNU Fortran 95 runtime library (libgfortran).
7 Libgfortran is free software; you can redistribute it and/or
8 modify it under the terms of the GNU General Public
9 License as published by the Free Software Foundation; either
10 version 2 of the License, or (at your option) any later version.
12 In addition to the permissions in the GNU General Public License, the
13 Free Software Foundation gives you unlimited permission to link the
14 compiled version of this file into combinations with other programs,
15 and to distribute those combinations without any restriction coming
16 from the use of this file. (The General Public License restrictions
17 do apply in other respects; for example, they cover modification of
18 the file, and distribution when not linked into a combine
21 Libgfortran is distributed in the hope that it will be useful,
22 but WITHOUT ANY WARRANTY; without even the implied warranty of
23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 GNU General Public License for more details.
26 You should have received a copy of the GNU General Public
27 License along with libgfortran; see the file COPYING. If not,
28 write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
29 Boston, MA 02110-1301, USA. */
32 /* Unlike what the name of this file suggests, we don't actually
33 implement the Fortran intrinsics here. At least, not with the
34 names they have in the standard. The functions here provide all
35 the support we need for the standard string intrinsics, and the
36 compiler translates the actual intrinsics calls to calls to
37 functions in this file. */
43 #include "libgfortran.h"
46 /* String functions. */
48 extern void concat_string (GFC_INTEGER_4, char *,
49 GFC_INTEGER_4, const char *,
50 GFC_INTEGER_4, const char *);
51 export_proto(concat_string);
53 extern GFC_INTEGER_4 string_len_trim (GFC_INTEGER_4, const char *);
54 export_proto(string_len_trim);
56 extern void adjustl (char *, GFC_INTEGER_4, const char *);
57 export_proto(adjustl);
59 extern void adjustr (char *, GFC_INTEGER_4, const char *);
60 export_proto(adjustr);
62 extern GFC_INTEGER_4 string_index (GFC_INTEGER_4, const char *, GFC_INTEGER_4,
63 const char *, GFC_LOGICAL_4);
64 export_proto(string_index);
66 extern GFC_INTEGER_4 string_scan (GFC_INTEGER_4, const char *, GFC_INTEGER_4,
67 const char *, GFC_LOGICAL_4);
68 export_proto(string_scan);
70 extern GFC_INTEGER_4 string_verify (GFC_INTEGER_4, const char *, GFC_INTEGER_4,
71 const char *, GFC_LOGICAL_4);
72 export_proto(string_verify);
74 extern void string_trim (GFC_INTEGER_4 *, void **, GFC_INTEGER_4, const char *);
75 export_proto(string_trim);
77 extern void string_minmax (GFC_INTEGER_4 *, void **, int, int, ...);
78 export_proto(string_minmax);
80 /* Strings of unequal length are extended with pad characters. */
83 compare_string (GFC_INTEGER_4 len1, const char * s1,
84 GFC_INTEGER_4 len2, const char * s2)
87 const unsigned char *s;
90 res = memcmp (s1, s2, (len1 < len2) ? len1 : len2);
100 s = (unsigned char *) &s2[len1];
106 s = (unsigned char *) &s1[len2];
124 iexport(compare_string);
127 /* The destination and source should not overlap. */
130 concat_string (GFC_INTEGER_4 destlen, char * dest,
131 GFC_INTEGER_4 len1, const char * s1,
132 GFC_INTEGER_4 len2, const char * s2)
136 memcpy (dest, s1, destlen);
139 memcpy (dest, s1, len1);
145 memcpy (dest, s2, destlen);
149 memcpy (dest, s2, len2);
150 memset (&dest[len2], ' ', destlen - len2);
154 /* Return string with all trailing blanks removed. */
157 string_trim (GFC_INTEGER_4 * len, void ** dest, GFC_INTEGER_4 slen,
162 /* Determine length of result string. */
163 for (i = slen - 1; i >= 0; i--)
172 /* Allocate space for result string. */
173 *dest = internal_malloc_size (*len);
175 /* copy string if necessary. */
176 memmove (*dest, src, *len);
183 /* The length of a string not including trailing blanks. */
186 string_len_trim (GFC_INTEGER_4 len, const char * s)
190 for (i = len - 1; i >= 0; i--)
199 /* Find a substring within a string. */
202 string_index (GFC_INTEGER_4 slen, const char * str, GFC_INTEGER_4 sslen,
203 const char * sstr, GFC_LOGICAL_4 back)
218 last = slen + 1 - sslen;
225 start = slen - sslen;
229 for (; start != last; start+= delta)
231 for (i = 0; i < sslen; i++)
233 if (str[start + i] != sstr[i])
243 /* Remove leading blanks from a string, padding at end. The src and dest
244 should not overlap. */
247 adjustl (char *dest, GFC_INTEGER_4 len, const char *src)
252 while (i<len && src[i] == ' ')
256 memcpy (dest, &src[i], len - i);
258 memset (&dest[len - i], ' ', i);
262 /* Remove trailing blanks from a string. */
265 adjustr (char *dest, GFC_INTEGER_4 len, const char *src)
270 while (i > 0 && src[i - 1] == ' ')
274 memset (dest, ' ', len - i);
275 memcpy (dest + (len - i), src, i );
279 /* Scan a string for any one of the characters in a set of characters. */
282 string_scan (GFC_INTEGER_4 slen, const char * str, GFC_INTEGER_4 setlen,
283 const char * set, GFC_LOGICAL_4 back)
287 if (slen == 0 || setlen == 0)
292 for (i = slen - 1; i >= 0; i--)
294 for (j = 0; j < setlen; j++)
296 if (str[i] == set[j])
303 for (i = 0; i < slen; i++)
305 for (j = 0; j < setlen; j++)
307 if (str[i] == set[j])
317 /* Verify that a set of characters contains all the characters in a
318 string by identifying the position of the first character in a
319 characters that does not appear in a given set of characters. */
322 string_verify (GFC_INTEGER_4 slen, const char * str, GFC_INTEGER_4 setlen,
323 const char * set, GFC_LOGICAL_4 back)
345 for (; start != last; start += delta)
347 for (i = 0; i < setlen; i++)
349 if (str[start] == set[i])
360 /* MIN and MAX intrinsics for strings. The front-end makes sure that
361 nargs is at least 2. */
364 string_minmax (GFC_INTEGER_4 *rlen, void **dest, int op, int nargs, ...)
369 GFC_INTEGER_4 nextlen, reslen;
371 va_start (ap, nargs);
372 reslen = va_arg (ap, GFC_INTEGER_4);
373 res = va_arg (ap, char *);
377 runtime_error ("First argument of '%s' intrinsic should be present",
378 op > 0 ? "MAX" : "MIN");
380 for (i = 1; i < nargs; i++)
382 nextlen = va_arg (ap, GFC_INTEGER_4);
383 next = va_arg (ap, char *);
389 runtime_error ("Second argument of '%s' intrinsic should be "
390 "present", op > 0 ? "MAX" : "MIN");
398 if (op * compare_string (reslen, res, nextlen, next) < 0)
408 char * tmp = internal_malloc_size (*rlen);
409 memcpy (tmp, res, reslen);
410 memset (&tmp[reslen], ' ', *rlen - reslen);