mirror of
https://github.com/cookiengineer/audacity
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93 lines
2.9 KiB
C
93 lines
2.9 KiB
C
/* finddefault.c -- find_default_device() implementation
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Roger Dannenberg, Jan 2009
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "portmidi.h"
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#define STRING_MAX 256
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/* skip over spaces, return first non-space */
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void skip_spaces(FILE *inf)
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{
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char c;
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while (isspace(c = getc(inf))) ;
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ungetc(c, inf);
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}
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/* trim leading spaces and match a string */
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int match_string(FILE *inf, char *s)
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{
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skip_spaces(inf);
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while (*s && *s == getc(inf)) s++;
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return (*s == 0);
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}
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/*
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/* Parse preference files, find default device, search devices --
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*/
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PmDeviceID find_default_device(char *path, int input, PmDeviceID id)
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/* path -- the name of the preference we are searching for
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input -- true iff this is an input device
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id -- current default device id
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returns matching device id if found, otherwise id
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*/
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{
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static char *pref_2 = "/.java/.userPrefs/";
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static char *pref_3 = "prefs.xml";
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char *pref_1 = getenv("HOME");
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char *full_name, *path_ptr;
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FILE *inf;
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int c, i;
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if (!pref_1) goto nopref; // cannot find preference file
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// full_name will be larger than necessary
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full_name = malloc(strlen(pref_1) + strlen(pref_2) + strlen(pref_3) +
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strlen(path) + 2);
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strcpy(full_name, pref_1);
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strcat(full_name, pref_2);
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// copy all but last path segment to full_name
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if (*path == '/') path++; // skip initial slash in path
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path_ptr = strrchr(path, '/');
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if (path_ptr) { // copy up to slash after full_name
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path_ptr++;
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int offset = strlen(full_name);
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memcpy(full_name + offset, path, path_ptr - path);
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full_name[offset + path_ptr - path] = 0; // end of string
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} else {
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path_ptr = path;
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}
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strcat(full_name, pref_3);
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inf = fopen(full_name, "r");
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if (!inf) goto nopref; // cannot open preference file
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// We're not going to build or link in a full XML parser.
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// Instead, find the path string and quoute. Then, look for
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// "value", "=", quote. Then get string up to quote.
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while ((c = getc(inf)) != EOF) {
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char pref_str[STRING_MAX];
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if (c != '"') continue; // scan up to quote
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// look for quote string quote
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if (!match_string(inf, path_ptr)) continue; // path not found
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if (getc(inf) != '"') continue; // path not found, keep scanning
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if (!match_string(inf, "value")) goto nopref; // value not found
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if (!match_string(inf, "=")) goto nopref; // = not found
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if (!match_string(inf, "\"")) goto nopref; // quote not found
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// now read the value up to the close quote
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for (i = 0; i < STRING_MAX; i++) {
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if ((c = getc(inf)) == '"') break;
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pref_str[i] = c;
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}
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if (i == STRING_MAX) continue; // value too long, ignore
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pref_str[i] == 0;
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i = pm_find_default_device(pref_str, input);
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if (i != pmNoDevice) {
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id = i;
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}
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break;
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}
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nopref:
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return id;
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}
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