Super PC 33/Super PC 33 (Shareware).iso/spc/sonido/timidity/source/common.c

C/C++ Source or Header | 1995-08-03 | 5.2 KB | 229 lines

/*

    TiMidity -- Experimental MIDI to WAVE converter
    Copyright (C) 1995 Tuukka Toivonen <[e-mail]>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    common.c

    */

#include <stdio.h>
#include <stdlib.h>
#ifndef __WIN32__
#include <strings.h>
#else
#include <string.h>
#endif
#include <errno.h>
#include "config.h"
#include "common.h"
#include "output.h"
#include "controls.h"

#ifdef __WIN32__
#define OPEN_MODE "rb"
#else
#define OPEN_MODE "r"
#endif

char *program_name, current_filename[1024];

#ifdef DEFAULT_PATH
     /* The paths in this list will be tried whenever we're reading a file */
     static PathList defaultpathlist={DEFAULT_PATH,0};
     static PathList *pathlist=&defaultpathlist; /* This is a linked list */
#else
     static PathList *pathlist=0;
#endif

/* Try to open a file for reading. If the filename ends in one of the
    defined compressor extensions, pipe the file through the decompressor */
static FILE *try_to_open(char *name, int decompress, int noise_mode)
{
  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;
      char tmp[1024], tmp2[1024], *cp, *cp2;
        /* 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 ';':
          *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. */
FILE *open_file(char *name, int decompress, int noise_mode)
{
  FILE *fp;
  PathList *plp=pathlist;
  int l;

  if (!name || !(*name))
    {
      ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "Attempted to open nameless file.");
      return 0;
    }

  /* First try the given name */

  strncpy(current_filename, name, 1023);
  current_filename[1023]='\0';

  ctl->cmsg(CMSG_INFO, VERB_DEBUG, "Trying to open %s", current_filename);
  if ((fp=try_to_open(current_filename, decompress, noise_mode)))
    return fp;

  if (noise_mode && (errno != ENOENT))
    {
      ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "%s: %s",
       current_filename, sys_errlist[errno]);
      return 0;
    }

  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;
    if (noise_mode && (errno != ENOENT))
      {
        ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "%s: %s",
         current_filename, sys_errlist[errno]);
        return 0;
      }
    plp=plp->next;
      }

  /* Nothing could be opened. */

  *current_filename=0;

  if (noise_mode>=2)
    ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "%s: %s", name, sys_errlist[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;
  char tmp[1024];
  while (len>0)
    {
      c=len;
      if (c>1024) c=1024;
      len-=c;
      if (c!=fread(tmp, 1, c, fp))
    ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "%s: skip: %s",
         current_filename, sys_errlist[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();
  play_mode->purge_output();
  play_mode->close_output();
  exit(10);
}

/* This adds a directory to the path list */
void add_to_pathlist(char *s)
{
  PathList *plp=safe_malloc(sizeof(PathList));
  strcpy((plp->path=safe_malloc(strlen(s)+1)),s);
  plp->next=pathlist;
  pathlist=plp;
}