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 extern void string_repeat (char *, GFC_INTEGER_4
, const char *, GFC_INTEGER_4
);
77 export_proto(string_repeat
);
79 /* Strings of unequal length are extended with pad characters. */
82 compare_string (GFC_INTEGER_4 len1
, const char * s1
,
83 GFC_INTEGER_4 len2
, const char * s2
)
89 res
= memcmp (s1
, s2
, (len1
< len2
) ? len1
: len2
);
123 iexport(compare_string
);
126 /* The destination and source should not overlap. */
129 concat_string (GFC_INTEGER_4 destlen
, char * dest
,
130 GFC_INTEGER_4 len1
, const char * s1
,
131 GFC_INTEGER_4 len2
, const char * s2
)
135 memcpy (dest
, s1
, destlen
);
138 memcpy (dest
, s1
, len1
);
144 memcpy (dest
, s2
, destlen
);
148 memcpy (dest
, s2
, len2
);
149 memset (&dest
[len2
], ' ', destlen
- len2
);
153 /* Return string with all trailing blanks removed. */
156 string_trim (GFC_INTEGER_4
* len
, void ** dest
, GFC_INTEGER_4 slen
,
161 /* Determine length of result string. */
162 for (i
= slen
- 1; i
>= 0; i
--)
171 /* Allocate space for result string. */
172 *dest
= internal_malloc_size (*len
);
174 /* copy string if necessary. */
175 memmove (*dest
, src
, *len
);
180 /* The length of a string not including trailing blanks. */
183 string_len_trim (GFC_INTEGER_4 len
, const char * s
)
187 for (i
= len
- 1; i
>= 0; i
--)
196 /* Find a substring within a string. */
199 string_index (GFC_INTEGER_4 slen
, const char * str
, GFC_INTEGER_4 sslen
,
200 const char * sstr
, GFC_LOGICAL_4 back
)
215 last
= slen
+ 1 - sslen
;
222 start
= slen
- sslen
;
226 for (; start
!= last
; start
+= delta
)
228 for (i
= 0; i
< sslen
; i
++)
230 if (str
[start
+ i
] != sstr
[i
])
240 /* Remove leading blanks from a string, padding at end. The src and dest
241 should not overlap. */
244 adjustl (char *dest
, GFC_INTEGER_4 len
, const char *src
)
249 while (i
<len
&& src
[i
] == ' ')
253 memcpy (dest
, &src
[i
], len
- i
);
255 memset (&dest
[len
- i
], ' ', i
);
259 /* Remove trailing blanks from a string. */
262 adjustr (char *dest
, GFC_INTEGER_4 len
, const char *src
)
267 while (i
> 0 && src
[i
- 1] == ' ')
271 memset (dest
, ' ', len
- i
);
272 memcpy (dest
+ (len
- i
), src
, i
);
276 /* Scan a string for any one of the characters in a set of characters. */
279 string_scan (GFC_INTEGER_4 slen
, const char * str
, GFC_INTEGER_4 setlen
,
280 const char * set
, GFC_LOGICAL_4 back
)
284 if (slen
== 0 || setlen
== 0)
289 for (i
= slen
- 1; i
>= 0; i
--)
291 for (j
= 0; j
< setlen
; j
++)
293 if (str
[i
] == set
[j
])
300 for (i
= 0; i
< slen
; i
++)
302 for (j
= 0; j
< setlen
; j
++)
304 if (str
[i
] == set
[j
])
314 /* Verify that a set of characters contains all the characters in a
315 string by identifying the position of the first character in a
316 characters that does not appear in a given set of characters. */
319 string_verify (GFC_INTEGER_4 slen
, const char * str
, GFC_INTEGER_4 setlen
,
320 const char * set
, GFC_LOGICAL_4 back
)
342 for (; start
!= last
; start
+= delta
)
344 for (i
= 0; i
< setlen
; i
++)
346 if (str
[start
] == set
[i
])
357 /* Concatenate several copies of a string. */
360 string_repeat (char * dest
, GFC_INTEGER_4 slen
,
361 const char * src
, GFC_INTEGER_4 ncopies
)
365 /* See if ncopies is valid. */
368 /* The error is already reported. */
369 runtime_error ("Augument NCOPIES is negative.");
372 /* Copy characters. */
373 for (i
= 0; i
< ncopies
; i
++)
375 memmove (dest
+ (i
* slen
), src
, slen
);