Subversion Repositories SvarDOS

/*

 * This file is part of FDNPKG

 * Copyright (C) 2013-2016 Mateusz Viste, All rights reserved.

 */

#include <stdio.h>   /* fopen, fclose... */

#include <string.h>  /* strcasecmp() */

#include "lsm.h"     /* include self for control */

#include "rtrim.h"

#include "version.h"

/* reads a line from a file descriptor, and writes it to *line, the *line array is filled no more than maxlen bytes. returns the number of byte read on success, or a negative value on failure (reaching EOF is considered an error condition) */

static int readline_fromfile(FILE *fd, char *line, int maxlen) {

  int bytebuff, linelen = 0;

  for (;;) {

    bytebuff = fgetc(fd);

    if (bytebuff == EOF) {

      line[linelen] = 0;

      if (linelen == 0) return(-1);

      return(linelen);

    }

    if (bytebuff < 0) return(-1);

    if (bytebuff == '\r') continue; /* ignore CR */

    if (bytebuff == '\n') {

      line[linelen] = 0;

      return(linelen);

    }

    if (linelen < maxlen) line[linelen++] = bytebuff;

  }

}

/* Loads metadata from an LSM file. Returns 0 on success, non-zero on error. */

int readlsm(const char *filename, char *version, int version_maxlen) {

  char linebuff[128];

  char *valuestr;

  int x;

  FILE *fd;

  /* reset fields to be read to empty values */

  version[0] = 0;

  /* open the file */

  fd = fopen(filename, "rb");

  if (fd == NULL) return(-1);

  /* read the LSM file line by line */

  while (readline_fromfile(fd, linebuff, sizeof(linebuff) - 1) >= 0) {

    for (x = 0;; x++) {

      if (linebuff[x] == 0) {

        x = -1;

        break;

      } else if (linebuff[x] == ':') {

        break;

      }

    }

    if (x > 0) {

      linebuff[x] = 0;

      valuestr = linebuff + x + 1;

      trim(linebuff);

      trim(valuestr);

      if (strcasecmp(linebuff, "version") == 0) snprintf(version, version_maxlen, "%s", valuestr);

    }

  }

  fclose(fd);

  return(0);

}