code.delx.au - pulseaudio/blob - src/polypcore/conf-parser.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio 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. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <assert.h>
  27 #include <string.h>
  28 #include <stdio.h>
  29 #include <errno.h>
  30
  31 #include <polyp/xmalloc.h>
  32
  33 #include <polypcore/log.h>
  34 #include <polypcore/core-util.h>
  35
  36 #include "conf-parser.h"
  37
  38 #define WHITESPACE " \t\n"
  39 #define COMMENTS "#;\n"
  40
  41 /* Run the user supplied parser for an assignment */
  42 static int next_assignment(const char *filename, unsigned line, const pa_config_item *t, const char *lvalue, const char *rvalue, void *userdata) {
  43     assert(filename && t && lvalue && rvalue);
  44
  45     for (; t->parse; t++)
  46         if (!strcmp(lvalue, t->lvalue))
  47             return t->parse(filename, line, lvalue, rvalue, t->data, userdata);
  48
  49     pa_log(__FILE__": [%s:%u] Unknown lvalue '%s'.", filename, line, lvalue);
  50
  51     return -1;
  52 }
  53
  54 /* Returns non-zero when c is contained in s */
  55 static int in_string(char c, const char *s) {
  56     assert(s);
  57
  58     for (; *s; s++)
  59         if (*s == c)
  60             return 1;
  61
  62     return 0;
  63 }
  64
  65 /* Remove all whitepsapce from the beginning and the end of *s. *s may
  66  * be modified. */
  67 static char *strip(char *s) {
  68     char *b = s+strspn(s, WHITESPACE);
  69     char *e, *l = NULL;
  70
  71     for (e = b; *e; e++)
  72         if (!in_string(*e, WHITESPACE))
  73             l = e;
  74
  75     if (l)
  76         *(l+1) = 0;
  77
  78     return b;
  79 }
  80
  81 /* Parse a variable assignment line */
  82 static int parse_line(const char *filename, unsigned line, const pa_config_item *t, char *l, void *userdata) {
  83     char *e, *c, *b = l+strspn(l, WHITESPACE);
  84
  85     if ((c = strpbrk(b, COMMENTS)))
  86         *c = 0;
  87
  88     if (!*b)
  89         return 0;
  90
  91     if (!(e = strchr(b, '='))) {
  92         pa_log(__FILE__": [%s:%u] Missing '='.", filename, line);
  93         return -1;
  94     }
  95
  96     *e = 0;
  97     e++;
  98
  99     return next_assignment(filename, line, t, strip(b), strip(e), userdata);
 100 }
 101
 102 /* Go through the file and parse each line */
 103 int pa_config_parse(const char *filename, FILE *f, const pa_config_item *t, void *userdata) {
 104     int r = -1;
 105     unsigned line = 0;
 106     int do_close = !f;
 107     assert(filename && t);
 108
 109     if (!f && !(f = fopen(filename, "r"))) {
 110         if (errno == ENOENT) {
 111             r = 0;
 112             goto finish;
 113         }
 114
 115         pa_log(__FILE__": WARNING: failed to open configuration file '%s': %s", filename, strerror(errno));
 116         goto finish;
 117     }
 118
 119     while (!feof(f)) {
 120         char l[256];
 121         if (!fgets(l, sizeof(l), f)) {
 122             if (feof(f))
 123                 break;
 124
 125             pa_log(__FILE__": WARNING: failed to read configuration file '%s': %s", filename, strerror(errno));
 126             goto finish;
 127         }
 128
 129         if (parse_line(filename, ++line, t,  l, userdata) < 0)
 130             goto finish;
 131     }
 132
 133     r = 0;
 134
 135 finish:
 136
 137     if (do_close && f)
 138         fclose(f);
 139
 140     return r;
 141 }
 142
 143 int pa_config_parse_int(const char *filename, unsigned line, const char *lvalue, const char *rvalue, void *data, PA_GCC_UNUSED void *userdata) {
 144     int *i = data;
 145     int32_t k;
 146     assert(filename && lvalue && rvalue && data);
 147
 148     if (pa_atoi(rvalue, &k) < 0) {
 149         pa_log(__FILE__": [%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 150         return -1;
 151     }
 152
 153     *i = (int) k;
 154     return 0;
 155 }
 156
 157 int pa_config_parse_bool(const char *filename, unsigned line, const char *lvalue, const char *rvalue, void *data, PA_GCC_UNUSED void *userdata) {
 158     int *b = data, k;
 159     assert(filename && lvalue && rvalue && data);
 160
 161     if ((k = pa_parse_boolean(rvalue)) < 0) {
 162         pa_log(__FILE__": [%s:%u] Failed to parse boolean value: %s", filename, line, rvalue);
 163         return -1;
 164     }
 165
 166     *b = k;
 167
 168     return 0;
 169 }
 170
 171 int pa_config_parse_string(const char *filename, PA_GCC_UNUSED unsigned line, const char *lvalue, const char *rvalue, void *data, PA_GCC_UNUSED void *userdata) {
 172     char **s = data;
 173     assert(filename && lvalue && rvalue && data);
 174
 175     pa_xfree(*s);
 176     *s = *rvalue ? pa_xstrdup(rvalue) : NULL;
 177     return 0;
 178 }