lib/frrstr.c

   1 /*
   2  * FRR string processing utilities.
   3  * Copyright (C) 2018  Cumulus Networks, Inc.
   4  *                     Quentin Young
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 2 of the License, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include <string.h>
  22 #include <ctype.h>
  23 #include <sys/types.h>
  24 #include <regex.h>
  25
  26 #include "frrstr.h"
  27 #include "memory.h"
  28 #include "vector.h"
  29
  30 void frrstr_split(const char *string, const char *delimiter, char ***result,
  31                   int *argc)
  32 {
  33         if (!string)
  34                 return;
  35
  36         unsigned int sz = 4, idx = 0;
  37         char *copy, *copystart;
  38         *result = XCALLOC(MTYPE_TMP, sizeof(char *) * sz);
  39         copystart = copy = XSTRDUP(MTYPE_TMP, string);
  40         *argc = 0;
  41
  42         const char *tok = NULL;
  43
  44         while (copy) {
  45                 tok = strsep(&copy, delimiter);
  46                 (*result)[idx] = XSTRDUP(MTYPE_TMP, tok);
  47                 if (++idx == sz)
  48                         *result = XREALLOC(MTYPE_TMP, *result,
  49                                            (sz *= 2) * sizeof(char *));
  50                 (*argc)++;
  51         }
  52
  53         XFREE(MTYPE_TMP, copystart);
  54 }
  55
  56 vector frrstr_split_vec(const char *string, const char *delimiter)
  57 {
  58         char **result;
  59         int argc;
  60
  61         if (!string)
  62                 return NULL;
  63
  64         frrstr_split(string, delimiter, &result, &argc);
  65
  66         vector v = array_to_vector((void **)result, argc);
  67
  68         XFREE(MTYPE_TMP, result);
  69
  70         return v;
  71 }
  72
  73 char *frrstr_join(const char **parts, int argc, const char *join)
  74 {
  75         int i;
  76         char *str;
  77         char *p;
  78         size_t len = 0;
  79         size_t joinlen = join ? strlen(join) : 0;
  80
  81         for (i = 0; i < argc; i++)
  82                 len += strlen(parts[i]);
  83         len += argc * joinlen + 1;
  84
  85         if (!len)
  86                 return NULL;
  87
  88         p = str = XMALLOC(MTYPE_TMP, len);
  89
  90         for (i = 0; i < argc; i++) {
  91                 size_t arglen = strlen(parts[i]);
  92
  93                 memcpy(p, parts[i], arglen);
  94                 p += arglen;
  95                 if (i + 1 != argc && join) {
  96                         memcpy(p, join, joinlen);
  97                         p += joinlen;
  98                 }
  99         }
 100
 101         *p = '\0';
 102
 103         return str;
 104 }
 105
 106 char *frrstr_join_vec(vector v, const char *join)
 107 {
 108         char **argv;
 109         int argc;
 110
 111         vector_to_array(v, (void ***)&argv, &argc);
 112
 113         char *ret = frrstr_join((const char **)argv, argc, join);
 114
 115         XFREE(MTYPE_TMP, argv);
 116
 117         return ret;
 118 }
 119
 120 void frrstr_filter_vec(vector v, regex_t *filter)
 121 {
 122         regmatch_t ignored[1];
 123
 124         for (unsigned int i = 0; i < vector_active(v); i++) {
 125                 if (regexec(filter, vector_slot(v, i), 0, ignored, 0)) {
 126                         XFREE(MTYPE_TMP, vector_slot(v, i));
 127                         vector_unset(v, i);
 128                 }
 129         }
 130 }
 131
 132 void frrstr_strvec_free(vector v)
 133 {
 134         unsigned int i;
 135         char *cp;
 136
 137         if (!v)
 138                 return;
 139
 140         for (i = 0; i < vector_active(v); i++) {
 141                 cp = vector_slot(v, i);
 142                 XFREE(MTYPE_TMP, cp);
 143         }
 144
 145         vector_free(v);
 146 }
 147
 148 bool begins_with(const char *str, const char *prefix)
 149 {
 150         if (!str || !prefix)
 151                 return 0;
 152
 153         size_t lenstr = strlen(str);
 154         size_t lenprefix = strlen(prefix);
 155
 156         if (lenprefix > lenstr)
 157                 return 0;
 158
 159         return strncmp(str, prefix, lenprefix) == 0;
 160 }