/**
* Open the specified output file. If it already exists, load its
* contents and save the non-generated (hand edited) portions.
* If a "start mark" is found, everything before it is preserved leader.
* If not, the entire thing is a trailer. Assuming the start is found,
* then everything after the end marker is the trailer. If the end
* mark is not found, the file is actually corrupt, but we take the
* remainder to be the trailer.
*
* @param[in] fname the output file name
*/
static void
open_out(char const * fname)
{
do {
char * txt = script_text = load_old_output(fname);
char * scn;
if (txt == NULL)
break;
scn = strstr(txt, START_MARK);
if (scn == NULL) {
script_trailer = txt;
break;
}
*(scn++) = NUL;
scn = strstr(scn, END_MARK);
if (scn == NULL) {
/*
* The file is corrupt.
*/
script_trailer = txt + strlen(txt) + START_MARK_LEN + 1;
break;
}
/*
* Check to see if the data contains our marker.
* If it does, then we will skip over it
*/
script_trailer = scn + END_MARK_LEN;
script_leader = txt;
} while (false);
if (freopen(fname, "w" FOPEN_BINARY_FLAG, stdout) != stdout) {
fprintf(stderr, zFreopenFail, errno, strerror(errno));
exit(EXIT_FAILURE);
}
}
/**
* Open the specified output file. If it already exists, load its
* contents and save the non-generated (hand edited) portions.
* If a "start mark" is found, everything before it is preserved leader.
* If not, the entire thing is a trailer. Assuming the start is found,
* then everything after the end marker is the trailer. If the end
* mark is not found, the file is actually corrupt, but we take the
* remainder to be the trailer.
*
* @param[in] fname the output file name
*/
static void
open_out(char const * fname, char const * pname)
{
do {
char * txt = script_text = load_old_output(fname, pname);
char * scn;
if (txt == NULL)
break;
scn = strstr(txt, START_MARK);
if (scn == NULL) {
script_trailer = txt;
break;
}
*(scn++) = NUL;
scn = strstr(scn, END_MARK);
if (scn == NULL) {
/*
* The file is corrupt. Set the trailer to be everything
* after the start mark. The user will need to fix it up.
*/
script_trailer = txt + strlen(txt) + START_MARK_LEN + 1;
break;
}
/*
* Check to see if the data contains our marker.
* If it does, then we will skip over it
*/
script_trailer = scn + END_MARK_LEN;
script_leader = txt;
} while (false);
if (freopen(fname, "w" FOPEN_BINARY_FLAG, stdout) != stdout)
fserr_exit(pname, "freopen", fname);
}
