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fix(compat): drop fgetln compat shim, migrate prompt-history.c to getline

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Following up on the comment on #5365 - this drops fgetln from
prompt-history.c (its only remaining caller) in favor of getline, and
removes the fgetln compat shim entirely since nothing references it
anymore: the compat.h declaration, compat/fgetln.c itself, and its
entry in configure.ac's AC_REPLACE_FUNCS list.

fgetln doesn't null-terminate its returned buffer when the final line
in the file lacks a trailing newline, so the old loop had a second
branch to heap-copy and manually terminate that case. getline always
null-terminates regardless, so that branch goes away and the loop
becomes uniform.

Verified with a real build (ubuntu-24.04 container, same
--enable-utf8proc --enable-asan configure CI uses): crafted a history
file with a normal entry, a blank line, and a final entry with no
trailing newline at EOF (the exact case the removed branch existed
for), loaded it through a real ASan-built tmux via show-prompt-history,
all three entries came back correctly. Full regress suite is otherwise
clean against this change.
This commit is contained in:
Yayo Razo
2026-07-13 13:03:58 -06:00
parent 6fd9987632
commit c3e38b317d
4 changed files with 9 additions and 85 deletions
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27
prompt-history.c
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@@ -79,8 +79,9 @@ void
prompt_load_history(void)
{
FILE *f;
char *history_file, *line, *tmp;
size_t length;
char *history_file, *line = NULL;
size_t length = 0;
ssize_t got;
if ((history_file = prompt_find_history_file()) == NULL)
return;
@@ -94,23 +95,13 @@ prompt_load_history(void)
}
free(history_file);
for (;;) {
if ((line = fgetln(f, &length)) == NULL)
break;
if (length > 0) {
if (line[length - 1] == '\n') {
line[length - 1] = '\0';
prompt_add_typed_history(line);
} else {
tmp = xmalloc(length + 1);
memcpy(tmp, line, length);
tmp[length] = '\0';
prompt_add_typed_history(tmp);
free(tmp);
}
}
while ((got = getline(&line, &length, f)) != -1) {
if (got > 0 && line[got - 1] == '\n')
line[got - 1] = '\0';
if (got > 0)
prompt_add_typed_history(line);
}
free(line);
fclose(f);
}