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search: find, and thus delete, only exact matches from history

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This reverts commit df8c3de from six years ago, which prevented a crash
on the Armel/Maemo platforms but causes nano to lose history items.

The strncmp() function on those platforms treats size_t numbers with
the high bit set as if they were zero.  To avoid that, use a number
that cannot be seen as negative, as suggested by <alpha@qzx.com>.

This fixes https://savannah.gnu.org/bugs/?48048.

Tested-by: Tito Ragusa <farmatito@tiscali.it>
Signed-off-by: Benno Schulenberg <bensberg@justemail.net>
This commit is contained in:
Benno Schulenberg 2016-06-01 21:29:44 +02:00
parent e198c85053
commit 660584c1ea
2 changed files with 4 additions and 1 deletions
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3
src/nano.h
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@ -600,6 +600,9 @@ enum
/* The maximum number of bytes buffered at one time. */
#define MAX_BUF_SIZE 128
/* The largest size_t number that doesn't have the high bit set. */
#define HIGHEST_POSITIVE ((~(size_t)0) >> 1)
#ifdef REVISION
#define BRANDING PACKAGE_VERSION"-git "REVISION
#else

2
src/search.c
View File

@ -1221,7 +1221,7 @@ void update_history(filestruct **h, const char *s)
assert(hage != NULL && hbot != NULL);
/* See if this string is already in the history. */
thesame = find_history(*hbot, *hage, s, strlen(s));
thesame = find_history(*hbot, *hage, s, HIGHEST_POSITIVE);
/* If an identical string was found, delete that item. */
if (thesame != NULL) {