config.c

   1
   2 #include "cache.h"
   3
   4 #define MAXNAME (256)
   5
   6 static FILE *config_file;
   7 static int config_linenr;
   8 static int get_next_char(void)
   9 {
  10         int c;
  11         FILE *f;
  12
  13         c = '\n';
  14         if ((f = config_file) != NULL) {
  15                 c = fgetc(f);
  16                 if (c == '\n')
  17                         config_linenr++;
  18                 if (c == EOF) {
  19                         config_file = NULL;
  20                         c = '\n';
  21                 }
  22         }
  23         return c;
  24 }
  25
  26 static char *parse_value(void)
  27 {
  28         static char value[1024];
  29         int quote = 0, comment = 0, len = 0, space = 0;
  30
  31         for (;;) {
  32                 int c = get_next_char();
  33                 if (len >= sizeof(value))
  34                         return NULL;
  35                 if (c == '\n') {
  36                         if (quote)
  37                                 return NULL;
  38                         value[len] = 0;
  39                         return value;
  40                 }
  41                 if (comment)
  42                         continue;
  43                 if (isspace(c) && !quote) {
  44                         space = 1;
  45                         continue;
  46                 }
  47                 if (space) {
  48                         if (len)
  49                                 value[len++] = ' ';
  50                         space = 0;
  51                 }
  52                 if (c == '\\') {
  53                         c = get_next_char();
  54                         switch (c) {
  55                         case '\n':
  56                                 continue;
  57                         case 't':
  58                                 c = '\t';
  59                                 break;
  60                         case 'b':
  61                                 c = '\b';
  62                                 break;
  63                         case 'n':
  64                                 c = '\n';
  65                                 break;
  66                         /* Some characters escape as themselves */
  67                         case '\\': case '"':
  68                                 break;
  69                         /* Reject unknown escape sequences */
  70                         default:
  71                                 return NULL;
  72                         }
  73                         value[len++] = c;
  74                         continue;
  75                 }
  76                 if (c == '"') {
  77                         quote = 1-quote;
  78                         continue;
  79                 }
  80                 if (!quote) {
  81                         if (c == ';' || c == '#') {
  82                                 comment = 1;
  83                                 continue;
  84                         }
  85                 }
  86                 value[len++] = c;
  87         }
  88 }
  89
  90 static int get_value(config_fn_t fn, char *name, unsigned int len)
  91 {
  92         int c;
  93         char *value;
  94
  95         /* Get the full name */
  96         for (;;) {
  97                 c = get_next_char();
  98                 if (c == EOF)
  99                         break;
 100                 if (!isalnum(c))
 101                         break;
 102                 name[len++] = tolower(c);
 103                 if (len >= MAXNAME)
 104                         return -1;
 105         }
 106         name[len] = 0;
 107         while (c == ' ' || c == '\t')
 108                 c = get_next_char();
 109
 110         value = NULL;
 111         if (c != '\n') {
 112                 if (c != '=')
 113                         return -1;
 114                 value = parse_value();
 115                 if (!value)
 116                         return -1;
 117         }
 118         return fn(name, value);
 119 }
 120
 121 static int get_base_var(char *name)
 122 {
 123         int baselen = 0;
 124
 125         for (;;) {
 126                 int c = get_next_char();
 127                 if (c == EOF)
 128                         return -1;
 129                 if (c == ']')
 130                         return baselen;
 131                 if (!isalnum(c))
 132                         return -1;
 133                 if (baselen > MAXNAME / 2)
 134                         return -1;
 135                 name[baselen++] = tolower(c);
 136         }
 137 }
 138
 139 static int git_parse_file(config_fn_t fn)
 140 {
 141         int comment = 0;
 142         int baselen = 0;
 143         static char var[MAXNAME];
 144
 145         for (;;) {
 146                 int c = get_next_char();
 147                 if (c == '\n') {
 148                         /* EOF? */
 149                         if (!config_file)
 150                                 return 0;
 151                         comment = 0;
 152                         continue;
 153                 }
 154                 if (comment || isspace(c))
 155                         continue;
 156                 if (c == '#' || c == ';') {
 157                         comment = 1;
 158                         continue;
 159                 }
 160                 if (c == '[') {
 161                         baselen = get_base_var(var);
 162                         if (baselen <= 0)
 163                                 break;
 164                         var[baselen++] = '.';
 165                         var[baselen] = 0;
 166                         continue;
 167                 }
 168                 if (!isalpha(c))
 169                         break;
 170                 var[baselen] = tolower(c);
 171                 if (get_value(fn, var, baselen+1) < 0)
 172                         break;
 173         }
 174         die("bad config file line %d", config_linenr);
 175 }
 176
 177 int git_config_int(const char *name, const char *value)
 178 {
 179         if (value && *value) {
 180                 char *end;
 181                 int val = strtol(value, &end, 0);
 182                 if (!*end)
 183                         return val;
 184         }
 185         die("bad config value for '%s'", name);
 186 }
 187
 188 int git_config_bool(const char *name, const char *value)
 189 {
 190         if (!value)
 191                 return 1;
 192         if (!*value)
 193                 return 0;
 194         if (!strcasecmp(value, "true"))
 195                 return 1;
 196         if (!strcasecmp(value, "false"))
 197                 return 0;
 198         return git_config_int(name, value) != 0;
 199 }
 200
 201 int git_default_config(const char *var, const char *value)
 202 {
 203         /* This needs a better name */
 204         if (!strcmp(var, "core.filemode")) {
 205                 trust_executable_bit = git_config_bool(var, value);
 206                 return 0;
 207         }
 208
 209         if (!strcmp(var, "user.name")) {
 210                 strncpy(git_default_name, value, sizeof(git_default_name));
 211                 return 0;
 212         }
 213
 214         if (!strcmp(var, "user.email")) {
 215                 strncpy(git_default_email, value, sizeof(git_default_email));
 216                 return 0;
 217         }
 218
 219         /* Add other config variables here.. */
 220         return 0;
 221 }
 222
 223 int git_config(config_fn_t fn)
 224 {
 225         int ret;
 226         FILE *f = fopen(git_path("config"), "r");
 227
 228         ret = -1;
 229         if (f) {
 230                 config_file = f;
 231                 config_linenr = 1;
 232                 ret = git_parse_file(fn);
 233                 fclose(f);
 234         }
 235         return ret;
 236 }