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mateuszvis |
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/*
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* This file is part of FDNPKG
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* Copyright (C) 2013-2016 Mateusz Viste, All rights reserved.
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*/
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#include <stdio.h> /* fopen, fclose... */
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#include <string.h> /* strcasecmp() */
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#include "lsm.h" /* include self for control */
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#include "rtrim.h"
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#include "version.h"
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/* 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) */
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static int readline_fromfile(FILE *fd, char *line, int maxlen) {
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int bytebuff, linelen = 0;
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for (;;) {
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bytebuff = fgetc(fd);
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if (bytebuff == EOF) {
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line[linelen] = 0;
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if (linelen == 0) return(-1);
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return(linelen);
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}
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if (bytebuff < 0) return(-1);
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if (bytebuff == '\r') continue; /* ignore CR */
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if (bytebuff == '\n') {
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line[linelen] = 0;
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return(linelen);
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}
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if (linelen < maxlen) line[linelen++] = bytebuff;
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}
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}
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/* Loads metadata from an LSM file. Returns 0 on success, non-zero on error. */
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int readlsm(char *filename, char *version, int version_maxlen) {
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char linebuff[128];
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char *valuestr;
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int x;
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FILE *fd;
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/* reset fields to be read to empty values */
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version[0] = 0;
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/* open the file */
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fd = fopen(filename, "rb");
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if (fd == NULL) return(-1);
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/* check the file's header */
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if (readline_fromfile(fd, linebuff, 64) < 0) {
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fclose(fd);
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return(-1);
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}
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if (strcasecmp(linebuff, "begin3") != 0) {
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fclose(fd);
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return(-1);
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}
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/* read the LSM file line by line */
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while (readline_fromfile(fd, linebuff, 127) >= 0) {
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for (x = 0;; x++) {
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if (linebuff[x] == 0) {
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x = -1;
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break;
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} else if (linebuff[x] == ':') {
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break;
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}
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}
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if (x > 0) {
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linebuff[x] = 0;
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valuestr = linebuff + x + 1;
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trim(linebuff);
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trim(valuestr);
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if (strcasecmp(linebuff, "version") == 0) {
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snprintf(version, version_maxlen, "%s", valuestr);
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version[version_maxlen] = 0; /* snprintf is supposed to terminate string itself, but the DJGPP doesn't */
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}
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}
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}
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fclose(fd);
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return(0);
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}
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