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 <polypcore/log.h>
  32 #include <polypcore/util.h>
  33 #include <polypcore/xmalloc.h>
  34
  35 #include "conf-parser.h"
  36
  37 #define WHITESPACE " \t\n"
  38 #define COMMENTS "#;\n"
  39
  40 /* Run the user supplied parser for an assignment */
  41 static int next_assignment(const char *filename, unsigned line, const pa_config_item *t, const char *lvalue, const char *rvalue, void *userdata) {
  42     assert(filename && t && lvalue && rvalue);
  43
  44     for (; t->parse; t++)
  45         if (!strcmp(lvalue, t->lvalue))
  46             return t->parse(filename, line, lvalue, rvalue, t->data, userdata);
  47
  48     pa_log(__FILE__": [%s:%u] Unknown lvalue '%s'.\n", filename, line, lvalue);
  49
  50     return -1;
  51 }
  52
  53 /* Returns non-zero when c is contained in s */
  54 static int in_string(char c, const char *s) {
  55     assert(s);
  56
  57     for (; *s; s++)
  58         if (*s == c)
  59             return 1;
  60
  61     return 0;
  62 }
  63
  64 /* Remove all whitepsapce from the beginning and the end of *s. *s may
  65  * be modified. */
  66 static char *strip(char *s) {
  67     char *b = s+strspn(s, WHITESPACE);
  68     char *e, *l = NULL;
  69
  70     for (e = b; *e; e++)
  71         if (!in_string(*e, WHITESPACE))
  72             l = e;
  73
  74     if (l)
  75         *(l+1) = 0;
  76
  77     return b;
  78 }
  79
  80 /* Parse a variable assignment line */
  81 static int parse_line(const char *filename, unsigned line, const pa_config_item *t, char *l, void *userdata) {
  82     char *e, *c, *b = l+strspn(l, WHITESPACE);
  83
  84     if ((c = strpbrk(b, COMMENTS)))
  85         *c = 0;
  86
  87     if (!*b)
  88         return 0;
  89
  90     if (!(e = strchr(b, '='))) {
  91         pa_log(__FILE__": [%s:%u] Missing '='.\n", filename, line);
  92         return -1;
  93     }
  94
  95     *e = 0;
  96     e++;
  97
  98     return next_assignment(filename, line, t, strip(b), strip(e), userdata);
  99 }
 100
 101 /* Go through the file and parse each line */
 102 int pa_config_parse(const char *filename, FILE *f, const pa_config_item *t, void *userdata) {
 103     int r = -1;
 104     unsigned line = 0;
 105     int do_close = !f;
 106     assert(filename && t);
 107
 108     if (!f && !(f = fopen(filename, "r"))) {
 109         if (errno == ENOENT) {
 110             r = 0;
 111             goto finish;
 112         }
 113
 114         pa_log(__FILE__": WARNING: failed to open configuration file '%s': %s\n", filename, strerror(errno));
 115         goto finish;
 116     }
 117
 118     while (!feof(f)) {
 119         char l[256];
 120         if (!fgets(l, sizeof(l), f)) {
 121             if (feof(f))
 122                 break;
 123
 124             pa_log(__FILE__": WARNING: failed to read configuration file '%s': %s\n", filename, strerror(errno));
 125             goto finish;
 126         }
 127
 128         if (parse_line(filename, ++line, t,  l, userdata) < 0)
 129             goto finish;
 130     }
 131
 132     r = 0;
 133
 134 finish:
 135
 136     if (do_close && f)
 137         fclose(f);
 138
 139     return r;
 140 }
 141
 142 int pa_config_parse_int(const char *filename, unsigned line, const char *lvalue, const char *rvalue, void *data, PA_GCC_UNUSED void *userdata) {
 143     int *i = data;
 144     int32_t k;
 145     assert(filename && lvalue && rvalue && data);
 146
 147     if (pa_atoi(rvalue, &k) < 0) {
 148         pa_log(__FILE__": [%s:%u] Failed to parse numeric value: %s\n", filename, line, rvalue);
 149         return -1;
 150     }
 151
 152     *i = (int) k;
 153     return 0;
 154 }
 155
 156 int pa_config_parse_bool(const char *filename, unsigned line, const char *lvalue, const char *rvalue, void *data, PA_GCC_UNUSED void *userdata) {
 157     int *b = data, k;
 158     assert(filename && lvalue && rvalue && data);
 159
 160     if ((k = pa_parse_boolean(rvalue)) < 0) {
 161         pa_log(__FILE__": [%s:%u] Failed to parse boolean value: %s\n", filename, line, rvalue);
 162         return -1;
 163     }
 164
 165     *b = k;
 166
 167     return 0;
 168 }
 169
 170 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) {
 171     char **s = data;
 172     assert(filename && lvalue && rvalue && data);
 173
 174     pa_xfree(*s);
 175     *s = *rvalue ? pa_xstrdup(rvalue) : NULL;
 176     return 0;
 177 }