1 /* Copyright (C) 2002-2020 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 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 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 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 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 * 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 * 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 * 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 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 * 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