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| author | Aaron Young | 2019-01-09 20:35:39 +0100 |
|---|---|---|
| committer | Michael Brown | 2019-01-15 15:12:27 +0100 |
| commit | 3946aa9bac1b4a784924fab1693bfebfdd357438 (patch) | |
| tree | f3d76d225d0f7b16ad5a530c511a125714683bb7 /src | |
| parent | [efi] Fix error handling path in efi_snp_probe (diff) | |
| download | ipxe-3946aa9bac1b4a784924fab1693bfebfdd357438.tar.gz ipxe-3946aa9bac1b4a784924fab1693bfebfdd357438.tar.xz ipxe-3946aa9bac1b4a784924fab1693bfebfdd357438.zip | |
[libc] Fix strcmp()/strncmp() to return proper values
Fix strcmp() and strncmp() to return proper standard positive/negative
values for unequal strings. Current implementation is backwards
(i.e. the functions are returning negative when should be positive and
vice-versa).
Currently all consumers of these functions only check the return value
for ==0 or !=0 and so we can safely change the implementation without
breaking things.
Signed-off-by: Aaron Young <Aaron.Young@oracle.com>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src')
| -rw-r--r-- | src/core/string.c | 6 | ||||
| -rw-r--r-- | src/tests/string_test.c | 1 |
2 files changed, 4 insertions, 3 deletions
diff --git a/src/core/string.c b/src/core/string.c index 5a185e63..5bd9dae8 100644 --- a/src/core/string.c +++ b/src/core/string.c @@ -173,7 +173,7 @@ int strncmp ( const char *first, const char *second, size_t max ) { int diff; for ( ; max-- ; first_bytes++, second_bytes++ ) { - diff = ( *second_bytes - *first_bytes ); + diff = ( *first_bytes - *second_bytes ); if ( diff ) return diff; if ( ! *first_bytes ) @@ -195,8 +195,8 @@ int strcasecmp ( const char *first, const char *second ) { int diff; for ( ; ; first_bytes++, second_bytes++ ) { - diff = ( toupper ( *second_bytes ) - - toupper ( *first_bytes ) ); + diff = ( toupper ( *first_bytes ) - + toupper ( *second_bytes ) ); if ( diff ) return diff; if ( ! *first_bytes ) diff --git a/src/tests/string_test.c b/src/tests/string_test.c index 4693b5f6..a66501da 100644 --- a/src/tests/string_test.c +++ b/src/tests/string_test.c @@ -88,6 +88,7 @@ static void string_test_exec ( void ) { ok ( strcmp ( "Hello", "hello" ) != 0 ); ok ( strcmp ( "Hello", "Hello world!" ) != 0 ); ok ( strcmp ( "Hello world!", "Hello" ) != 0 ); + ok ( strcmp ( "abc", "def" ) < 0 ); /* Test strncmp() */ ok ( strncmp ( "", "", 0 ) == 0 ); |