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
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it under the terms of the Perl Artistic License, available in COPYING.
*/
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "config.h"
#include "common.h"
#include "output.h"
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#include "ctrlmode.h"
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/* I guess "rb" should be right for any libc */
#define OPEN_MODE "rb"
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char current_filename[PATH_MAX];
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static PathList *pathlist=NULL;
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/* Try to open a file for reading. If the filename ends in one of the
defined compressor extensions, pipe the file through the decompressor */
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static FILE *try_to_open(const char *name, int decompress, int noise_mode)
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{
FILE *fp;
fp=fopen(name, OPEN_MODE); /* First just check that the file exists */
if (!fp)
return 0;
#ifdef DECOMPRESSOR_LIST
if (decompress)
{
int l,el;
static char *decompressor_list[] = DECOMPRESSOR_LIST, **dec;
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const char *cp;
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char tmp[PATH_MAX], tmp2[PATH_MAX], *cp2;
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/* Check if it's a compressed file */
l=strlen(name);
for (dec=decompressor_list; *dec; dec+=2)
{
el=strlen(*dec);
if ((el>=l) || (strcmp(name+l-el, *dec)))
continue;
/* Yes. Close the file, open a pipe instead. */
fclose(fp);
/* Quote some special characters in the file name */
cp=name;
cp2=tmp2;
while (*cp)
{
switch(*cp)
{
case '\'':
case '\\':
case ' ':
case '`':
case '!':
case '"':
case '&':
case ';':
*cp2++='\\';
}
*cp2++=*cp++;
}
*cp2=0;
sprintf(tmp, *(dec+1), tmp2);
fp=popen(tmp, "r");
break;
}
}
#endif
return fp;
}
/* This is meant to find and open files for reading, possibly piping
them through a decompressor. */
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FILE *open_file(const char *name, int decompress, int noise_mode)
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{
FILE *fp;
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PathList *plp;
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int l;
if (!name || !(*name))
{
ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "Attempted to open nameless file.");
return 0;
}
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if (pathlist==NULL) {
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/* Generate path list */
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#ifdef DEFAULT_PATH
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add_to_pathlist(DEFAULT_PATH);
#endif
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#ifdef DEFAULT_PATH1
add_to_pathlist(DEFAULT_PATH1);
#endif
#ifdef DEFAULT_PATH2
add_to_pathlist(DEFAULT_PATH2);
#endif
}
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/* First try the given name */
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strncpy(current_filename, name, PATH_MAX - 1);
current_filename[PATH_MAX - 1]='\0';
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ctl->cmsg(CMSG_INFO, VERB_DEBUG, "Trying to open %s", current_filename);
if ((fp=try_to_open(current_filename, decompress, noise_mode)))
return fp;
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#ifdef ENOENT
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if (noise_mode && (errno != ENOENT))
{
ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "%s: %s",
current_filename, strerror(errno));
return 0;
}
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plp=pathlist;
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if (name[0] != PATH_SEP)
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)
strcat(current_filename, PATH_STRING);
}
strcat(current_filename, name);
ctl->cmsg(CMSG_INFO, VERB_DEBUG, "Trying to open %s", current_filename);
if ((fp=try_to_open(current_filename, decompress, noise_mode)))
return fp;
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#ifdef ENOENT
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if (noise_mode && (errno != ENOENT))
{
ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "%s: %s",
current_filename, strerror(errno));
return 0;
}
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plp=plp->next;
}
/* Nothing could be opened. */
*current_filename=0;
if (noise_mode>=2)
ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "%s: %s", name, strerror(errno));
return 0;
}
/* This closes files opened with open_file */
void close_file(FILE *fp)
{
#ifdef DECOMPRESSOR_LIST
if (pclose(fp)) /* Any better ideas? */
#endif
fclose(fp);
}
/* This is meant for skipping a few bytes in a file or fifo. */
void skip(FILE *fp, size_t len)
{
size_t c;
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char tmp[PATH_MAX];
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while (len>0)
{
c=len;
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if (c>PATH_MAX) c=PATH_MAX;
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len-=c;
if (c!=fread(tmp, 1, c, fp))
ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "%s: skip: %s",
current_filename, strerror(errno));
}
}
/* This'll allocate memory or die. */
void *safe_malloc(size_t count)
{
void *p;
if (count > (1<<21))
{
ctl->cmsg(CMSG_FATAL, VERB_NORMAL,
"Strange, I feel like allocating %d bytes. This must be a bug.",
count);
}
else if ((p=malloc(count)))
return p;
else
ctl->cmsg(CMSG_FATAL, VERB_NORMAL, "Sorry. Couldn't malloc %d bytes.", count);
ctl->close();
exit(10);
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return(NULL);
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}
/* This adds a directory to the path list */
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void add_to_pathlist(const char *s)
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{
PathList *plp=safe_malloc(sizeof(PathList));
strcpy((plp->path=safe_malloc(strlen(s)+1)),s);
plp->next=pathlist;
pathlist=plp;
}
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/* Free memory associated to path list */
void free_pathlist(void)
{
PathList *plp, *next_plp;
plp = pathlist;
while (plp) {
if (plp->path) {
free(plp->path);
plp->path=NULL;
}
next_plp = plp->next;
free(plp);
plp = next_plp;
}
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pathlist = NULL;