1 /* String intrinsics helper functions.
2 Copyright 2002, 2005 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. */
42 #include "libgfortran.h"
45 /* String functions. */
47 extern void concat_string (GFC_INTEGER_4, char *,
48 GFC_INTEGER_4, const char *,
49 GFC_INTEGER_4, const char *);
50 export_proto(concat_string);
52 extern GFC_INTEGER_4 string_len_trim (GFC_INTEGER_4, const char *);
53 export_proto(string_len_trim);
55 extern void adjustl (char *, GFC_INTEGER_4, const char *);
56 export_proto(adjustl);
58 extern void adjustr (char *, GFC_INTEGER_4, const char *);
59 export_proto(adjustr);
61 extern GFC_INTEGER_4 string_index (GFC_INTEGER_4, const char *, GFC_INTEGER_4,
62 const char *, GFC_LOGICAL_4);
63 export_proto(string_index);
65 extern GFC_INTEGER_4 string_scan (GFC_INTEGER_4, const char *, GFC_INTEGER_4,
66 const char *, GFC_LOGICAL_4);
67 export_proto(string_scan);
69 extern GFC_INTEGER_4 string_verify (GFC_INTEGER_4, const char *, GFC_INTEGER_4,
70 const char *, GFC_LOGICAL_4);
71 export_proto(string_verify);
73 extern void string_trim (GFC_INTEGER_4 *, void **, GFC_INTEGER_4, const char *);
74 export_proto(string_trim);
76 /* Strings of unequal length are extended with pad characters. */
79 compare_string (GFC_INTEGER_4 len1, const char * s1,
80 GFC_INTEGER_4 len2, const char * s2)
83 const unsigned char *s;
86 res = memcmp (s1, s2, (len1 < len2) ? len1 : len2);
96 s = (unsigned char *) &s2[len1];
102 s = (unsigned char *) &s1[len2];
120 iexport(compare_string);
123 /* The destination and source should not overlap. */
126 concat_string (GFC_INTEGER_4 destlen, char * dest,
127 GFC_INTEGER_4 len1, const char * s1,
128 GFC_INTEGER_4 len2, const char * s2)
132 memcpy (dest, s1, destlen);
135 memcpy (dest, s1, len1);
141 memcpy (dest, s2, destlen);
145 memcpy (dest, s2, len2);
146 memset (&dest[len2], ' ', destlen - len2);
150 /* Return string with all trailing blanks removed. */
153 string_trim (GFC_INTEGER_4 * len, void ** dest, GFC_INTEGER_4 slen,
158 /* Determine length of result string. */
159 for (i = slen - 1; i >= 0; i--)
168 /* Allocate space for result string. */
169 *dest = internal_malloc_size (*len);
171 /* copy string if necessary. */
172 memmove (*dest, src, *len);
177 /* The length of a string not including trailing blanks. */
180 string_len_trim (GFC_INTEGER_4 len, const char * s)
184 for (i = len - 1; i >= 0; i--)
193 /* Find a substring within a string. */
196 string_index (GFC_INTEGER_4 slen, const char * str, GFC_INTEGER_4 sslen,
197 const char * sstr, GFC_LOGICAL_4 back)
212 last = slen + 1 - sslen;
219 start = slen - sslen;
223 for (; start != last; start+= delta)
225 for (i = 0; i < sslen; i++)
227 if (str[start + i] != sstr[i])
237 /* Remove leading blanks from a string, padding at end. The src and dest
238 should not overlap. */
241 adjustl (char *dest, GFC_INTEGER_4 len, const char *src)
246 while (i<len && src[i] == ' ')
250 memcpy (dest, &src[i], len - i);
252 memset (&dest[len - i], ' ', i);
256 /* Remove trailing blanks from a string. */
259 adjustr (char *dest, GFC_INTEGER_4 len, const char *src)
264 while (i > 0 && src[i - 1] == ' ')
268 memset (dest, ' ', len - i);
269 memcpy (dest + (len - i), src, i );
273 /* Scan a string for any one of the characters in a set of characters. */
276 string_scan (GFC_INTEGER_4 slen, const char * str, GFC_INTEGER_4 setlen,
277 const char * set, GFC_LOGICAL_4 back)
281 if (slen == 0 || setlen == 0)
286 for (i = slen - 1; i >= 0; i--)
288 for (j = 0; j < setlen; j++)
290 if (str[i] == set[j])
297 for (i = 0; i < slen; i++)
299 for (j = 0; j < setlen; j++)
301 if (str[i] == set[j])
311 /* Verify that a set of characters contains all the characters in a
312 string by identifying the position of the first character in a
313 characters that does not appear in a given set of characters. */
316 string_verify (GFC_INTEGER_4 slen, const char * str, GFC_INTEGER_4 setlen,
317 const char * set, GFC_LOGICAL_4 back)
339 for (; start != last; start += delta)
341 for (i = 0; i < setlen; i++)
343 if (str[start] == set[i])