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common.c
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/
common.c
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/*
TiMidity -- Experimental MIDI to WAVE converter
Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi>
This program is free software; you can redistribute it and/or modify
it under the terms of the Perl Artistic License, available in COPYING.
common.c
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "SDL.h"
#include "options.h"
#include "common.h"
/* The paths in this list will be tried whenever we're reading a file */
static PathList *pathlist = NULL; /* This is a linked list */
/* This is meant to find and open files for reading */
SDL_RWops *open_file(const char *name)
{
SDL_RWops *rw;
if (!name || !(*name))
{
SNDDBG(("Attempted to open nameless file.\n"));
return 0;
}
/* First try the given name */
SNDDBG(("Trying to open %s\n", name));
if ((rw = SDL_RWFromFile(name, "rb")))
return rw;
if (name[0] != PATH_SEP)
{
char current_filename[1024];
PathList *plp = pathlist;
size_t l;
while (plp) /* Try along the path then */
{
*current_filename = 0;
l = strlen(plp->path);
if(l)
{
strcpy(current_filename, plp->path);
if(current_filename[l - 1] != PATH_SEP)
{
current_filename[l] = PATH_SEP;
current_filename[l + 1] = '\0';
}
}
strcat(current_filename, name);
SNDDBG(("Trying to open %s\n", current_filename));
if ((rw = SDL_RWFromFile(current_filename, "rb")))
return rw;
plp = plp->next;
}
}
/* Nothing could be opened. */
SNDDBG(("Could not open %s\n", name));
return 0;
}
/* This'll allocate memory or die. */
void *safe_malloc(size_t count)
{
void *p;
p = malloc(count);
if (p == NULL)
SNDDBG(("Sorry. Couldn't malloc %d bytes.\n", count));
return p;
}
/* This adds a directory to the path list */
void add_to_pathlist(const char *s)
{
PathList *plp = safe_malloc(sizeof(PathList));
if (plp == NULL)
return;
plp->path = safe_malloc(strlen(s) + 1);
if (plp->path == NULL)
{
free(plp);
return;
}
strcpy(plp->path, s);
plp->next = pathlist;
pathlist = plp;
}
void free_pathlist(void)
{
PathList *plp = pathlist;
PathList *next;
while (plp)
{
next = plp->next;
free(plp->path);
free(plp);
plp = next;
}
pathlist = NULL;
}