1 /* Copyright (C) 2002-2018 Free Software Foundation, Inc.
2 Contributed by Paul Brook
3
4 This file is part of the GNU Fortran runtime library (libgfortran).
5
6 Libgfortran is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
9 any later version.
10
11 Libgfortran is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 Under Section 7 of GPL version 3, you are granted additional
17 permissions described in the GCC Runtime Library Exception, version
18 3.1, as published by the Free Software Foundation.
19
20 You should have received a copy of the GNU General Public License and
21 a copy of the GCC Runtime Library Exception along with this program;
22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 <http://www.gnu.org/licenses/>. */
24
25 #include "libgfortran.h"
26 #include <string.h>
27 #include <strings.h>
28
29
30 /* Given a fortran string, return its length exclusive of the trailing
31 spaces. */
32
33 gfc_charlen_type
fstrlen(const char * string,gfc_charlen_type len)34 fstrlen (const char *string, gfc_charlen_type len)
35 {
36 for (; len > 0; len--)
37 if (string[len-1] != ' ')
38 break;
39
40 return len;
41 }
42
43
44 /* Copy a Fortran string (not null-terminated, hence length arguments
45 for both source and destination strings. Returns the non-padded
46 length of the destination. */
47
48 gfc_charlen_type
fstrcpy(char * dest,gfc_charlen_type destlen,const char * src,gfc_charlen_type srclen)49 fstrcpy (char *dest, gfc_charlen_type destlen,
50 const char *src, gfc_charlen_type srclen)
51 {
52 if (srclen >= destlen)
53 {
54 /* This will truncate if too long. */
55 memcpy (dest, src, destlen);
56 return destlen;
57 }
58 else
59 {
60 memcpy (dest, src, srclen);
61 /* Pad with spaces. */
62 memset (&dest[srclen], ' ', destlen - srclen);
63 return srclen;
64 }
65 }
66
67
68 /* Copy a null-terminated C string to a non-null-terminated Fortran
69 string. Returns the non-padded length of the destination string. */
70
71 gfc_charlen_type
cf_strcpy(char * dest,gfc_charlen_type dest_len,const char * src)72 cf_strcpy (char *dest, gfc_charlen_type dest_len, const char *src)
73 {
74 size_t src_len;
75
76 src_len = strlen (src);
77
78 if (src_len >= (size_t) dest_len)
79 {
80 /* This will truncate if too long. */
81 memcpy (dest, src, dest_len);
82 return dest_len;
83 }
84 else
85 {
86 memcpy (dest, src, src_len);
87 /* Pad with spaces. */
88 memset (&dest[src_len], ' ', dest_len - src_len);
89 return src_len;
90 }
91 }
92
93
94 #ifndef HAVE_STRNLEN
95 static size_t
strnlen(const char * s,size_t maxlen)96 strnlen (const char *s, size_t maxlen)
97 {
98 for (size_t ii = 0; ii < maxlen; ii++)
99 {
100 if (s[ii] == '\0')
101 return ii;
102 }
103 return maxlen;
104 }
105 #endif
106
107
108 #ifndef HAVE_STRNDUP
109 static char *
strndup(const char * s,size_t n)110 strndup (const char *s, size_t n)
111 {
112 size_t len = strnlen (s, n);
113 char *p = malloc (len + 1);
114 if (!p)
115 return NULL;
116 memcpy (p, s, len);
117 p[len] = '\0';
118 return p;
119 }
120 #endif
121
122
123 /* Duplicate a non-null-terminated Fortran string to a malloced
124 null-terminated C string. */
125
126 char *
fc_strdup(const char * src,gfc_charlen_type src_len)127 fc_strdup (const char *src, gfc_charlen_type src_len)
128 {
129 gfc_charlen_type n = fstrlen (src, src_len);
130 char *p = strndup (src, n);
131 if (!p)
132 os_error ("Memory allocation failed in fc_strdup");
133 return p;
134 }
135
136
137 /* Duplicate a non-null-terminated Fortran string to a malloced
138 null-terminated C string, without getting rid of trailing
139 blanks. */
140
141 char *
fc_strdup_notrim(const char * src,gfc_charlen_type src_len)142 fc_strdup_notrim (const char *src, gfc_charlen_type src_len)
143 {
144 char *p = strndup (src, src_len);
145 if (!p)
146 os_error ("Memory allocation failed in fc_strdup");
147 return p;
148 }
149
150
151 /* Given a fortran string and an array of st_option structures, search through
152 the array to find a match. If the option is not found, we generate an error
153 if no default is provided. */
154
155 int
find_option(st_parameter_common * cmp,const char * s1,gfc_charlen_type s1_len,const st_option * opts,const char * error_message)156 find_option (st_parameter_common *cmp, const char *s1, gfc_charlen_type s1_len,
157 const st_option * opts, const char *error_message)
158 {
159 /* Strip trailing blanks from the Fortran string. */
160 size_t len = (size_t) fstrlen (s1, s1_len);
161
162 for (; opts->name; opts++)
163 if (len == strlen(opts->name) && strncasecmp (s1, opts->name, len) == 0)
164 return opts->value;
165
166 generate_error (cmp, LIBERROR_BAD_OPTION, error_message);
167
168 return -1;
169 }
170
171
172 /* gfc_itoa()-- Integer to decimal conversion.
173 The itoa function is a widespread non-standard extension to
174 standard C, often declared in <stdlib.h>. Even though the itoa
175 defined here is a static function we take care not to conflict with
176 any prior non-static declaration. Hence the 'gfc_' prefix, which
177 is normally reserved for functions with external linkage. Notably,
178 in contrast to the *printf() family of functions, this ought to be
179 async-signal-safe. */
180
181 const char *
gfc_itoa(GFC_INTEGER_LARGEST n,char * buffer,size_t len)182 gfc_itoa (GFC_INTEGER_LARGEST n, char *buffer, size_t len)
183 {
184 int negative;
185 char *p;
186 GFC_UINTEGER_LARGEST t;
187
188 if (len < GFC_ITOA_BUF_SIZE)
189 sys_abort ();
190
191 if (n == 0)
192 return "0";
193
194 negative = 0;
195 t = n;
196 if (n < 0)
197 {
198 negative = 1;
199 t = -n; /*must use unsigned to protect from overflow*/
200 }
201
202 p = buffer + GFC_ITOA_BUF_SIZE - 1;
203 *p = '\0';
204
205 while (t != 0)
206 {
207 *--p = '0' + (t % 10);
208 t /= 10;
209 }
210
211 if (negative)
212 *--p = '-';
213 return p;
214 }
215