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-rw-r--r--configfile.c87
1 files changed, 87 insertions, 0 deletions
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1/* configfile.c: parsing of config files
2 *
3 * Copyright (C) 2008 Lars Hjemli
4 *
5 * Licensed under GNU General Public License v2
6 * (see COPYING for full license text)
7 */
8
9#include <ctype.h>
10#include <stdio.h>
11#include "configfile.h"
12
13int next_char(FILE *f)
14{
15 int c = fgetc(f);
16 if (c=='\r') {
17 c = fgetc(f);
18 if (c!='\n') {
19 ungetc(c, f);
20 c = '\r';
21 }
22 }
23 return c;
24}
25
26void skip_line(FILE *f)
27{
28 int c;
29
30 while((c=next_char(f)) && c!='\n' && c!=EOF)
31 ;
32}
33
34int read_config_line(FILE *f, char *line, const char **value, int bufsize)
35{
36 int i = 0, isname = 0;
37
38 *value = NULL;
39 while(i<bufsize-1) {
40 int c = next_char(f);
41 if (!isname && (c=='#' || c==';')) {
42 skip_line(f);
43 continue;
44 }
45 if (!isname && isspace(c))
46 continue;
47
48 if (c=='=' && !*value) {
49 line[i] = 0;
50 *value = &line[i+1];
51 } else if (c=='\n' && !isname) {
52 i = 0;
53 continue;
54 } else if (c=='\n' || c==EOF) {
55 line[i] = 0;
56 break;
57 } else {
58 line[i]=c;
59 }
60 isname = 1;
61 i++;
62 }
63 line[i+1] = 0;
64 return i;
65}
66
67int parse_configfile(const char *filename, configfile_value_fn fn)
68{
69 static int nesting;
70 int len;
71 char line[256];
72 const char *value;
73 FILE *f;
74
75 /* cancel deeply nested include-commands */
76 if (nesting > 8)
77 return -1;
78 if (!(f = fopen(filename, "r")))
79 return -1;
80 nesting++;
81 while((len = read_config_line(f, line, &value, sizeof(line))) > 0)
82 fn(line, value);
83 nesting--;
84 fclose(f);
85 return 0;
86}
87