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/*
* apt-spy (c) Steven Holmes, 2003.
* This software is licensed as detailed in the LICENSE file.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <libgen.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "include/global.h"
#include "include/file.h"
/* Selects an infile */
FILE *select_infile(char *infile)
{
if (infile != NULL)
return fopen(infile, "r");
/* Else return a temporary file */
return tmpfile();
}
/* Selects an output file */
FILE *select_outfile(char *outfile)
{
FILE *fp;
/* Check if we've to use standard output... */
if (strcmp(outfile, "-") == 0)
return stdout;
/* Otherwise, we open the file */
else {
if (backup(outfile) == 1) /* backup old file */
return NULL;
fp = fopen(outfile, "w");
}
return fp;
}
/* Open configuration file */
FILE *select_config(char *config_file)
{
FILE *fp;
if (config_file == NULL)
config_file = d_config;
fp = fopen(config_file, "r");
return fp;
}
FILE *select_mirror(char *mirror_list, int are_updating)
{
FILE *fp;
if (mirror_list == NULL)
mirror_list = d_mirror;
if (are_updating == 1)
fp = fopen(mirror_list, "w");
else
fp = fopen(mirror_list, "r");
return fp;
}
char *next_entry(FILE *infile_p)
{
char *temp;
unsigned long orig_position, buffsize;
int c;
/* Save original file position */
orig_position = ftell(infile_p);
/* Fast-forward to new line */
while ((c = getc(infile_p)) != '\n') {
if (c == EOF)
{
return NULL; /* We've exhausted the list */
}
}
buffsize = ftell(infile_p) - orig_position; /* Calculate buffer size */
/* create storage space for line */
temp = malloc(buffsize + 1);
if (temp == NULL) {
perror("malloc");
exit(1);
}
/* Rewind file to original position */
fseek(infile_p, orig_position, SEEK_SET);
/* We now read the line into the newly created buffer */
fgets(temp, buffsize + 1, infile_p);
return temp;
}
/* If orig_file exists, copy it to a new file with ".bak" appended */
/* Upon error, "1" is returned*/
int backup(char *orig_file)
{
FILE *in_file, *out_file;
char *new_name;
int c, namesize;
struct stat file_stat;
if (stat(orig_file, &file_stat) == -1) {
if (errno == ENOENT)
return 0; /* doesn't exist */
else {
perror("stat"); /* or there's been an error */
return 1;
}
}
if (file_stat.st_size == 0)
return 0; /* Don't backup empty file */
in_file = fopen(orig_file, "r");
if (in_file == NULL) {
perror("fopen"); /* eep! */
return 1;
}
/* Saves multiple calls to strlen() later */
namesize = strlen(orig_file);
/* We need to create the new filename. */
new_name = malloc(namesize + 5);
strncpy(new_name, orig_file, namesize + 1);
/* We append ".bak" to the end of the backup file */
strncat(new_name, ".bak", namesize + 5);
out_file = fopen(new_name, "w");
if (out_file == NULL)
return 1;
/* Do the copying */
while((c = getc(in_file)) != EOF)
putc(c, out_file);
if (ferror(in_file) || ferror(out_file)) {
perror("putc");
return 1;
}
fclose(in_file);
fclose(out_file);
free(new_name);
return 0;
}
int check_write_access(char *path)
{
/* Thanks to Brian from warner-debbugs@lothar.com for pointing out and
fixing the programming error here. */
char *dir = strdup(path); /* Leak it, it's small */
if (access(path, R_OK | W_OK) == -1) {
if (access(dirname(dir), R_OK | W_OK) == -1) {
perror("access");
return 1;
}
else if (errno == ENOENT)
return 0; /* Doesn't exist */
else {
perror("access"); /* Error */
return 1;
}
}
return 0;
}
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