xconfig.c

   1 /* evilwm - Minimalist Window Manager for X
   2  * Copyright (C) 1999-2009 Ciaran Anscomb
   3  * see README for license and other details. */
   4
   5 #include <ctype.h>
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9
  10 #include "xconfig.h"
  11
  12 static struct xconfig_option *find_option(struct xconfig_option *options,
  13                 const char *opt) {
  14         int i;
  15         for (i = 0; options[i].type != XCONFIG_END; i++) {
  16                 if (0 == strcmp(options[i].name, opt)) {
  17                         return &options[i];
  18                 }
  19         }
  20         return NULL;
  21 }
  22
  23 static void set_option(struct xconfig_option *option, const char *arg) {
  24         switch (option->type) {
  25                 case XCONFIG_BOOL:
  26                         *(int *)option->dest = 1;
  27                         break;
  28                 case XCONFIG_INT:
  29                         *(int *)option->dest = strtol(arg, NULL, 0);
  30                         break;
  31                 case XCONFIG_STRING:
  32                         *(char **)option->dest = strdup(arg);
  33                         break;
  34                 case XCONFIG_CALL_0:
  35                         ((void (*)(void))option->dest)();
  36                         break;
  37                 case XCONFIG_CALL_1:
  38                         ((void (*)(const char *))option->dest)(arg);
  39                         break;
  40                 default:
  41                         break;
  42         }
  43 }
  44
  45 /* Simple parser: one directive per line, "option argument" */
  46 enum xconfig_result xconfig_parse_file(struct xconfig_option *options,
  47                 const char *filename) {
  48         struct xconfig_option *option;
  49         char buf[256];
  50         char *line, *opt, *arg;
  51         FILE *cfg;
  52         cfg = fopen(filename, "r");
  53         if (cfg == NULL) return XCONFIG_FILE_ERROR;
  54         while ((line = fgets(buf, sizeof(buf), cfg))) {
  55                 while (isspace((int)*line))
  56                         line++;
  57                 if (*line == 0 || *line == '#')
  58                         continue;
  59                 opt = strtok(line, "\t\n\v\f\r =");
  60                 if (opt == NULL) continue;
  61                 arg = strtok(NULL, "\t\n\v\f\r =");
  62                 option = find_option(options, opt);
  63                 if (option == NULL) {
  64                         fclose(cfg);
  65                         return XCONFIG_BAD_OPTION;
  66                 }
  67                 set_option(option, arg);
  68         }
  69         fclose(cfg);
  70         return XCONFIG_OK;
  71 }
  72
  73 enum xconfig_result xconfig_parse_cli(struct xconfig_option *options,
  74                 int argc, char **argv, int *argn) {
  75         struct xconfig_option *option;
  76         int _argn;
  77         char *optstr;
  78         _argn = argn ? *argn : 1;
  79
  80         while (_argn < argc) {
  81                 if (argv[_argn][0] != '-') {
  82                         break;
  83                 }
  84                 if (0 == strcmp("--", argv[_argn])) {
  85                         _argn++;
  86                         break;
  87                 }
  88                 optstr = argv[_argn]+1;
  89                 if (*optstr == '-') optstr++;
  90                 option = find_option(options, optstr);
  91                 if (option == NULL) {
  92                         if (argn) *argn = _argn;
  93                         return XCONFIG_BAD_OPTION;
  94                 }
  95                 if (option->type == XCONFIG_BOOL
  96                                 || option->type == XCONFIG_CALL_0) {
  97                         set_option(option, NULL);
  98                         _argn++;
  99                         continue;
 100                 }
 101                 if ((_argn + 1) >= argc) {
 102                         if (argn) *argn = _argn;
 103                         return XCONFIG_MISSING_ARG;
 104                 }
 105                 set_option(option, argv[_argn+1]);
 106                 _argn += 2;
 107         }
 108         if (argn) *argn = _argn;
 109         return XCONFIG_OK;
 110 }