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pacman/callback.c: handle empty pkgname

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In pacman's progress callback, pkgname being null may result in a
segfault, due to undefined printf behaviour.  libalpm always passes
at least an empty string for pkgname, so this situation is largely
avoided.

However, the callback mostly checked for pkgname's being non-null
and not empty.  This means a additional space was being added to
the output messages (although with zero actual effect on the output).

Be a bit more robust here by treating null and empty pkgname the
same and fixing the invisible output issue...

Signed-off-by: Allan McRae <allan@archlinux.org>
This commit is contained in:
Allan McRae 2024-01-26 18:29:30 +10:00
parent b30dac6a5b
commit 74deada511
1 changed files with 12 additions and 5 deletions
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11
src/pacman/callback.c
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@ -569,6 +569,7 @@ void cb_progress(void *ctx, alpm_progress_t event, const char *pkgname,
/* used for wide character width determination and printing */
int len, wclen, wcwid, padwid;
wchar_t *wcstr;
int has_pkgname = (pkgname && pkgname[0] != '\0' ? 1 : 0);
const unsigned short cols = getcols();
@ -589,7 +590,7 @@ void cb_progress(void *ctx, alpm_progress_t event, const char *pkgname,
} else {
if(current != prevcurrent) {
/* update always */
} else if(!pkgname || percent == prevpercent ||
} else if(has_pkgname || percent == prevpercent ||
get_update_timediff(0) < UPDATE_SPEED_MS) {
/* only update the progress bar when we have a package name, the
* percentage has changed, and it has been long enough. */
@ -653,19 +654,25 @@ void cb_progress(void *ctx, alpm_progress_t event, const char *pkgname,
* by the output, and then pad it accordingly so we fill the terminal.
*/
/* len = opr len + pkgname len (if available) + space + null */
len = strlen(opr) + ((pkgname) ? strlen(pkgname) : 0) + 2;
len = strlen(opr) + (has_pkgname ? strlen(pkgname) + 1 : 0) + 1;
wcstr = calloc(len, sizeof(wchar_t));
/* print our strings to the alloc'ed memory */
#if defined(HAVE_SWPRINTF)
if(has_pkgname) {
wclen = swprintf(wcstr, len, L"%s %s", opr, pkgname);
} else {
wclen = swprintf(wcstr, len, L"%s", opr);
}
#else
/* because the format string was simple, we can easily do this without
* using swprintf, although it is probably not as safe/fast. The max
* chars we can copy is decremented each time by subtracting the length
* of the already printed/copied wide char string. */
wclen = mbstowcs(wcstr, opr, len);
if(has_pkgname) {
wclen += mbstowcs(wcstr + wclen, " ", len - wclen);
wclen += mbstowcs(wcstr + wclen, pkgname, len - wclen);
}
#endif
wcwid = wcswidth(wcstr, wclen);
padwid = textlen - wcwid;