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libc+libluna: Add case-insensitive string comparison functions

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This commit is contained in:
apio 2023-07-22 11:58:28 +02:00
parent c17e1a5802
commit 9ef09cfc88
Signed by: apio
GPG Key ID: B8A7D06E42258954
4 changed files with 56 additions and 2 deletions
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8
libc/include/string.h
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@ -1,4 +1,4 @@
/* string.h: String manipulation. */
/* string.h: String and memory manipulation. */
#ifndef _STRING_H
#define _STRING_H
@ -89,6 +89,12 @@ extern "C"
/* Locate a string (needle) in another one (haystack). */
char* strstr(const char* haystack, const char* needle);
/* Compare two null-terminated strings, ignoring case. */
int strcasecmp(const char* a, const char* b);
/* Compare two fixed-size null-terminated strings, ignoring case. */
int strncasecmp(const char* a, const char* b, size_t max);
#ifdef __cplusplus
}
#endif

23
libc/include/strings.h Normal file
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@ -0,0 +1,23 @@
/* strings.h: String operations. */
#ifndef _STRINGS_H
#define _STRINGS_H
#include <sys/types.h>
#ifdef __cplusplus
extern "C"
{
#endif
/* Compare two null-terminated strings, ignoring case. */
int strcasecmp(const char* a, const char* b);
/* Compare two fixed-size null-terminated strings, ignoring case. */
int strncasecmp(const char* a, const char* b, size_t max);
#ifdef __cplusplus
}
#endif
#endif

5
libluna/include/luna/CString.h
View File

@ -7,7 +7,7 @@ extern "C"
void* memset(void* buf, int c, usize n);
int memcmp(const void* a, const void* b, usize n);
void* memmove(void* dest, const void* src, usize n);
void* memchr(const void* buf, int c, size_t n);
void* memchr(const void* buf, int c, usize n);
usize strlen(const char* str);
usize strnlen(const char* str, usize max);
@ -41,4 +41,7 @@ extern "C"
char* strpbrk(const char* s, const char* accept);
char* strstr(const char* haystack, const char* needle);
int strcasecmp(const char* a, const char* b);
int strncasecmp(const char* a, const char* b, usize max);
}

22
libluna/src/CString.cpp
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@ -1,5 +1,6 @@
#include <luna/Alloc.h>
#include <luna/CString.h>
#include <luna/CType.h>
extern "C"
{
@ -297,4 +298,25 @@ extern "C"
return nullptr;
}
int strcasecmp(const char* a, const char* b)
{
while (*a && (_tolower(*a) == _tolower(*b)))
{
a++;
b++;
}
return _tolower(*(const u8*)a) - _tolower(*(const u8*)b);
}
int strncasecmp(const char* a, const char* b, usize max)
{
const char* s = a;
while (*a && (_tolower(*a) == _tolower(*b)) && (usize)(a - s) < (max - 1))
{
a++;
b++;
}
return _tolower(*(const u8*)a) - _tolower(*(const u8*)b);
}
}