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/* utility functions
*
* This file is part of nsgenbind.
* Published under the MIT License,
* http://www.opensource.org/licenses/mit-license.php
* Copyright 2015 Vincent Sanders <vince@netsurf-browser.org>
*/
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <errno.h>
#include <stdlib.h>
#include "options.h"
#include "utils.h"
/* exported function documented in utils.h */
char *genb_fpath(const char *fname)
{
char *fpath;
int fpathl;
fpathl = strlen(options->outdirname) + strlen(fname) + 2;
fpath = malloc(fpathl);
snprintf(fpath, fpathl, "%s/%s", options->outdirname, fname);
return fpath;
}
static char *genb_fpath_tmp(const char *fname)
{
char *fpath;
int fpathl;
fpathl = strlen(options->outdirname) + strlen(fname) + 3;
fpath = malloc(fpathl);
snprintf(fpath, fpathl, "%s/%s~", options->outdirname, fname);
return fpath;
}
/* exported function documented in utils.h */
FILE *genb_fopen(const char *fname, const char *mode)
{
char *fpath;
FILE *filef;
fpath = genb_fpath(fname);
filef = fopen(fpath, mode);
if (filef == NULL) {
fprintf(stderr, "Error: unable to open file %s (%s)\n",
fpath, strerror(errno));
free(fpath);
return NULL;
}
free(fpath);
return filef;
}
/* exported function documented in utils.h */
FILE *genb_fopen_tmp(const char *fname)
{
char *fpath;
FILE *filef;
fpath = genb_fpath_tmp(fname);
filef = fopen(fpath, "w+");
if (filef == NULL) {
fprintf(stderr, "Error: unable to open file %s (%s)\n",
fpath, strerror(errno));
free(fpath);
return NULL;
}
free(fpath);
return filef;
}
int genb_fclose_tmp(FILE *filef_tmp, const char *fname)
{
char *fpath;
char *tpath;
FILE *filef;
char tbuf[1024];
char fbuf[1024];
size_t trd;
size_t frd;
fpath = genb_fpath(fname);
tpath = genb_fpath_tmp(fname);
filef = fopen(fpath, "r");
if (filef == NULL) {
/* unable to open target file for comparison */
fclose(filef_tmp); /* close tmpfile */
remove(fpath);
rename(tpath, fpath);
} else {
rewind(filef_tmp);
frd = fread(fbuf, 1, 1024, filef);
while (frd != 0) {
trd = fread(tbuf, 1, frd, filef_tmp);
if ((trd != frd) ||
(memcmp(tbuf, fbuf, trd) != 0)) {
/* file doesnt match */
fclose(filef_tmp);
remove(fpath);
rename(tpath, fpath);
goto close_done;
}
frd = fread(fbuf, 1, 1024, filef);
}
/* was the same kill temporary file */
fclose(filef_tmp);
fclose(filef);
remove(tpath);
}
close_done:
free(fpath);
free(tpath);
return 0;
}
#ifdef NEED_STRNDUP
char *strndup(const char *s, size_t n)
{
size_t len;
char *s2;
for (len = 0; len != n && s[len]; len++)
continue;
s2 = malloc(len + 1);
if (!s2)
return 0;
memcpy(s2, s, len);
s2[len] = 0;
return s2;
}
#endif
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