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         while (copy) {
  44                 tok = strsep(&copy, delimiter);
  45                 (*result)[idx] = XSTRDUP(MTYPE_TMP, tok);
  46                 if (++idx == sz)
  47                         *result = XREALLOC(MTYPE_TMP, *result,
  48                                            (sz *= 2) * sizeof(char *));
  49                 (*argc)++;
  50         }
  51
  52         XFREE(MTYPE_TMP, copystart);
  53
  54         return;
  55 }
  56
  57 vector frrstr_split_vec(const char *string, const char *delimiter)
  58 {
  59         char **result;
  60         int argc;
  61
  62         frrstr_split(string, delimiter, &result, &argc);
  63
  64         vector v = array_to_vector((void **)result, argc);
  65         XFREE(MTYPE_TMP, result);
  66         return v;
  67 }
  68
  69 char *frrstr_join(const char **parts, int argc, const char *join)
  70 {
  71         int i;
  72         char *str;
  73         char *p;
  74         size_t len = 0;
  75         size_t joinlen = join ? strlen(join) : 0;
  76
  77         for (i = 0; i < argc; i++)
  78                 len += strlen(parts[i]);
  79         len += argc * joinlen + 1;
  80
  81         if (!len)
  82                 return NULL;
  83
  84         p = str = XMALLOC(MTYPE_TMP, len);
  85
  86         for (i = 0; i < argc; i++) {
  87                 size_t arglen = strlen(parts[i]);
  88                 memcpy(p, parts[i], arglen);
  89                 p += arglen;
  90                 if (i + 1 != argc) {
  91                         memcpy(p, join, joinlen);
  92                         p += joinlen;
  93                 }
  94         }
  95
  96         *p = '\0';
  97
  98         return str;
  99 }
 100
 101 char *frrstr_join_vec(vector v, const char *join)
 102 {
 103         char **argv;
 104         int argc;
 105
 106         vector_to_array(v, (void ***)&argv, &argc);
 107
 108         char *ret = frrstr_join((const char **)argv, argc, join);
 109
 110         XFREE(MTYPE_TMP, argv);
 111
 112         return ret;
 113 }
 114
 115 void frrstr_filter_vec(vector v, regex_t *filter)
 116 {
 117         regmatch_t ignored[1];
 118         for (unsigned int i = 0; i < vector_active(v); i++) {
 119                 if (regexec(filter, vector_slot(v, i), 0, ignored, 0)) {
 120                         XFREE(MTYPE_TMP, vector_slot(v, i));
 121                         vector_unset(v, i);
 122                 }
 123         }
 124 }
 125
 126 void frrstr_strvec_free(vector v)
 127 {
 128         unsigned int i;
 129         char *cp;
 130
 131         if (!v)
 132                 return;
 133
 134         for (i = 0; i < vector_active(v); i++) {
 135                 cp = vector_slot(v, i);
 136                 XFREE(MTYPE_TMP, cp);
 137         }
 138
 139         vector_free(v);
 140 }
 141
 142 bool begins_with(const char *str, const char *prefix)
 143 {
 144         if (!str || !prefix)
 145                 return 0;
 146         size_t lenstr = strlen(str);
 147         size_t lenprefix = strlen(prefix);
 148         if (lenprefix > lenstr)
 149                 return 0;
 150         return strncmp(str, prefix, lenprefix) == 0;
 151 }