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files: look for digits and colons starting from the end of the filename

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Starting from the end of the provided filename avoids needlessly looking
at colons that are somewhere in the middle of the path or the filename.

It also avoids inconsistenly interpreting a specified line number as a
column number when the filename itself ends with a colon plus digits
and the filename without the colon plus digits exists too.

This also removes the eliding of a backslash before a colon, which
would mangle the filename if the name actually contained a backslash
followed by a colon.

Negative line and column numbers are no longer allowed when using the
colon notation.

This fixes https://savannah.gnu.org/bugs/?65781,
and fixes https://savannah.gnu.org/bugs/?65782.

Problems existed since version 8.0, since colon parsing was introduced.
This commit is contained in:
Benno Schulenberg 2024-05-25 12:02:33 +02:00
parent 259a3c70e3
commit add945e717
1 changed files with 16 additions and 16 deletions
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32
src/nano.c
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@ -2500,24 +2500,24 @@ int main(int argc, char **argv)
struct stat fileinfo;
/* If the filename contains a colon and this file does not exist,
* then check if the filename ends with a number (while skipping
* any colon preceded by a backslash and eliding the backslash).
* If there is a valid trailing number, chop colon and number off.
* then check if the filename ends with digits preceded by a colon
* (possibly preceded by more digits and a colon). If there is or
* are such trailing numbers, chop the colons plus numbers off.
* The number is later used to place the cursor on that line. */
if (strchr(filename, ':') && stat(filename, &fileinfo) < 0) {
char *colon = filename + (*filename ? 1 : 0);
while ((colon = strchr(colon, ':'))) {
if (*(colon - 1) == '\\')
memmove(colon - 1, colon, strlen(colon) + 1);
else if (parse_line_column(colon + 1, &givenline, &givencol)) {
*colon = '\0';
if (stat(filename, &fileinfo) < 0) {
*colon++ = ':';
givencol = 0;
}
} else
++colon;
char *coda = filename + strlen(filename);
maybe_two:
while (--coda > filename + 1 && ('0' <= *coda && *coda <= '9'))
;
if (*coda == ':' && ('0' <= *(coda + 1) && *(coda +1) <= '9')) {
*coda = '\0';
if (stat(filename, &fileinfo) < 0) {
*coda = ':';
/* If this was the first colon, look for a second one. */
if (!strchr(coda + 1, ':'))
goto maybe_two;
} else if (!parse_line_column(coda + 1, &givenline, &givencol))
die(_("Invalid number\n"));
}
}