src/lib/string.c

   1 /************************************************************************
   2 * string.c
   3 * voxelands - 3d voxel world sandbox game
   4 * Copyright (C) Lisa 'darkrose' Milne 2016 <lisa@ltmnet.com>
   5 *
   6 * This program 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 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful, but
  12 * WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  14 * See the GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program.  If not, see <http://www.gnu.org/licenses/>
  18 ************************************************************************/
  19
  20 #include "common.h"
  21
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <ctype.h>
  25
  26 /* remove whitespace from beginning and end of a string */
  27 char* trim(char* str)
  28 {
  29         int l;
  30
  31         while (*str && isspace(*str)) {
  32                 str++;
  33         }
  34
  35         l = strlen(str);
  36         while (--l > -1 && (!str[l] || isspace(str[l]))) {
  37                 str[l] = 0;
  38         }
  39
  40         return str;
  41 }
  42
  43 /* allocate memory and copy a string */
  44 char* strdup(const char* str)
  45 {
  46         char* r;
  47         int l;
  48
  49         if (!str)
  50                 return NULL;
  51
  52         l = strlen(str);
  53         l++;
  54
  55         r = malloc(l);
  56         if (!r)
  57                 return NULL;
  58
  59         if (!memcpy(r,str,l)) {
  60                 free(r);
  61                 return NULL;
  62         }
  63
  64         return r;
  65 }
  66
  67 /* append str to dest, only if there's room for all of it */
  68 int strappend(char* dest, int size, char* str)
  69 {
  70         int l;
  71
  72         l = strlen(dest);
  73         l += strlen(str);
  74
  75         if (l >= size)
  76                 return 0;
  77
  78         strcat(dest,str);
  79
  80         return l;
  81 }
  82
  83 /* makes a string safe for use as a file or directory name */
  84 int str_sanitise(char* dest, int size, char* str)
  85 {
  86         int o = 0;
  87         int i = 0;
  88         int lws = 0;
  89
  90         for (; o<size; i++) {
  91                 if (!str[i]) {
  92                         dest[o] = 0;
  93                         return o;
  94                 }
  95                 if (isalnum(str[i])) {
  96                         lws = 0;
  97                         dest[o++] = str[i];
  98                 }else if (!lws) {
  99                         dest[o++] = '_';
 100                         lws = 1;
 101                 }
 102         }
 103
 104         return -1;
 105 }
 106
 107 /* parse a string into a bool true/false 1/0 */
 108 int parse_bool(char* str)
 109 {
 110         if (str) {
 111                 if (!strcmp(str,"true"))
 112                         return 1;
 113                 if (!strcmp(str,"yes"))
 114                         return 1;
 115                 if (!strcmp(str,"on"))
 116                         return 1;
 117                 if (!strcmp(str,"enabled"))
 118                         return 1;
 119                 if (!strcmp(str,"active"))
 120                         return 1;
 121                 if (strtol(str,NULL,10))
 122                         return 1;
 123         }
 124
 125         return 0;
 126 }