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/*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "pages.h"
#include "config.h"
int
createfile(const char *file)
{
/*
* create file at location 'file' using the template
* overwrite if it exists
* assume the caller has put us in the base directory already
*/
struct stat sb = {0};
if(!stat(output_dir, &sb) == 0 && !S_ISDIR(sb.st_mode))
{
fprintf(stderr, "directory '%s' does not exist, trying to make directory..\n", output_dir);
if (mkdir(output_dir, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH) != 0)
{
fprintf(stderr, "unable to mkdir '%s', unrecoverable failure\n", output_dir);
return 0;
}
fprintf(stderr, "OK\n");
}
char filename[512] = {0};
size_t length = 512;
strncat(filename, output_dir, length-1);
length = length - strlen(output_dir);
strncat(filename, file, length-1);
FILE *out = fopen(filename, "w");
if (!out)
{
fprintf(stderr, "unable to open file '%s', unrecoverable failure\n", filename);
return 0;
}
FILE *in = fopen(template_file, "r");
if (!in)
{
fprintf(stderr, "unable to open file '%s', unrecoverable failure\n", filename);
fclose(out);
return 0;
}
char c;
while ((c = fgetc(in)) != EOF)
{
fputc(c, out);
}
fclose(out);
fclose(in);
return 1;
}
long
findstring(const char *file, const char *str)
{
/*
* find first occurance of substring 'str' in file 'output_dir'/'file'
* return offset of string beginning
* -1 on error (including not found)
*
* return value is a long obtained by ftell(), set the position later using fseek()
* (use SEEK_SET as whence for beginning of file)
*/
long offset = -1;
char filename[512] = {0};
size_t length = 512;
strncat(filename, output_dir, length-1);
length = length - strlen(output_dir);
strncat(filename, file, length-1);
FILE *in = fopen(filename, "r");
if (!in)
{
fprintf(stderr, "unable to open file '%s', unrecoverable failure\n", filename);
return -1;
}
/* hacky */
char buffer[1024] = {0};
char *strpos = NULL;
while (fgets(buffer, 1024, in) != NULL)
{
strpos = strstr(buffer, str);
if (strpos)
{
/* found our substring */
break;
}
memset(buffer, 0, 1024);
continue;
}
if (!strpos)
{
fprintf(stderr, "unable to find substring '%s' in '%s'\n", str, filename);
fclose(in);
return -1;
}
/* we have the line that holds our substring, find out where it is in the file */
long curpos = ftell(in);
if (!curpos)
{
fprintf(stderr, "ftell() failed\n");
fclose(in);
return -1;
}
// strpos-buffer = first byte of str in line
offset = (curpos - strlen(buffer)+1) + strpos-buffer;
fclose(in);
return offset;
}
int
deletebytes(const char *file, long offset, size_t bytes)
{
/*
* delete 'bytes' bytes from 'output_dir'/'file' starting at offset 'offset'
* return 1 on success. 0 on failure
*/
char filename[512] = {0};
size_t length = 512;
strncat(filename, output_dir, length-1);
length = length - strlen(output_dir);
strncat(filename, file, length-1);
FILE *in = fopen(filename, "r");
if (!in)
{
fprintf(stderr, "unable to open file '%s', unrecoverable failure\n", filename);
return 0;
}
FILE *out = fopen("tmp.tmp", "w");
if (!out)
{
fprintf(stderr, "unable to open temporary file, unrecoverable failure\n");
fclose(in);
return 0;
}
long curpos = 1;
char c;
/* read bytes from 'in' and write them to 'out', skipping 'bytes' bytes starting at 'offset' */
while ((c = fgetc(in)) != EOF)
{
if (curpos >= offset && curpos <= ((offset-1)+bytes))
{
; // byte is one we want to skip
}
else
fputc(c, out);
curpos++;
}
/* delete 'filename' and move our temp file 'out' to take its place */
fclose(in);
if (remove(filename) == -1)
{
fprintf(stderr, "unable to delete file '%s', unrecoverable failure\n", filename);
fclose(out);
return 0;
}
if (rename("tmp.tmp", filename) == -1)
{
fprintf(stderr, "unable to rename tmp file to '%s', unrecoverable failure\n", filename);
fclose(out);
return 0;
}
fclose(out);
return 1;
}
int
frontpage(int flags)
{
if (!createfile(frontpage_index_output))
{
fprintf(stderr, "unable to generate frontpage\n");
return 0;
}
long substrpos = -1;
substrpos = findstring(frontpage_index_output, "cirno");
if (substrpos < 0)
{
fprintf(stderr, "unable to generate frontpage\n");
return 0;
}
printf("first occurance of '%s' is at byte %ld\n", "cirno", substrpos);
if (!deletebytes(frontpage_index_output, substrpos, strlen("cirno")))
{
fprintf(stderr, "unable to generate frontpage\n");
return 0;
}
return 1;
}
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