| /* |
| * linux/lib/string.c |
| * |
| * Copyright (C) 1991, 1992 Linus Torvalds |
| */ |
| |
| /* |
| * stupid library routines.. The optimized versions should generally be found |
| * as inline code in <asm-xx/string.h> |
| * |
| * These are buggy as well.. |
| * |
| * * Fri Jun 25 1999, Ingo Oeser <ioe@informatik.tu-chemnitz.de> |
| * - Added strsep() which will replace strtok() soon (because strsep() is |
| * reentrant and should be faster). Use only strsep() in new code, please. |
| */ |
| |
| #include "config.h" |
| #include "libc/string.h" |
| #include "libc/stdlib.h" |
| |
| /** |
| * strnicmp - Case insensitive, length-limited string comparison |
| * @s1: One string |
| * @s2: The other string |
| * @len: the maximum number of characters to compare |
| */ |
| int strnicmp(const char *s1, const char *s2, size_t len) |
| { |
| /* Yes, Virginia, it had better be unsigned */ |
| unsigned char c1, c2; |
| |
| c1 = 0; c2 = 0; |
| if (len) { |
| do { |
| c1 = *s1; c2 = *s2; |
| s1++; s2++; |
| if (!c1) |
| break; |
| if (!c2) |
| break; |
| if (c1 == c2) |
| continue; |
| c1 = tolower(c1); |
| c2 = tolower(c2); |
| if (c1 != c2) |
| break; |
| } while (--len); |
| } |
| return (int)c1 - (int)c2; |
| } |
| |
| /** |
| * strcpy - Copy a %NUL terminated string |
| * @dest: Where to copy the string to |
| * @src: Where to copy the string from |
| */ |
| char * strcpy(char * dest,const char *src) |
| { |
| char *tmp = dest; |
| |
| while ((*dest++ = *src++) != '\0') |
| /* nothing */; |
| return tmp; |
| } |
| |
| /** |
| * strncpy - Copy a length-limited, %NUL-terminated string |
| * @dest: Where to copy the string to |
| * @src: Where to copy the string from |
| * @count: The maximum number of bytes to copy |
| * |
| * Note that unlike userspace strncpy, this does not %NUL-pad the buffer. |
| * However, the result is not %NUL-terminated if the source exceeds |
| * @count bytes. |
| */ |
| char * strncpy(char * dest,const char *src,size_t count) |
| { |
| char *tmp = dest; |
| |
| while (count-- && (*dest++ = *src++) != '\0') |
| /* nothing */; |
| |
| return tmp; |
| } |
| |
| /** |
| * strcat - Append one %NUL-terminated string to another |
| * @dest: The string to be appended to |
| * @src: The string to append to it |
| */ |
| char * strcat(char * dest, const char * src) |
| { |
| char *tmp = dest; |
| |
| while (*dest) |
| dest++; |
| while ((*dest++ = *src++) != '\0') |
| ; |
| |
| return tmp; |
| } |
| |
| /** |
| * strncat - Append a length-limited, %NUL-terminated string to another |
| * @dest: The string to be appended to |
| * @src: The string to append to it |
| * @count: The maximum numbers of bytes to copy |
| * |
| * Note that in contrast to strncpy, strncat ensures the result is |
| * terminated. |
| */ |
| char * strncat(char *dest, const char *src, size_t count) |
| { |
| char *tmp = dest; |
| |
| if (count) { |
| while (*dest) |
| dest++; |
| while ((*dest++ = *src++)) { |
| if (--count == 0) { |
| *dest = '\0'; |
| break; |
| } |
| } |
| } |
| |
| return tmp; |
| } |
| |
| /** |
| * strcmp - Compare two strings |
| * @cs: One string |
| * @ct: Another string |
| */ |
| int strcmp(const char * cs,const char * ct) |
| { |
| register signed char __res; |
| |
| while (1) { |
| if ((__res = *cs - *ct++) != 0 || !*cs++) |
| break; |
| } |
| |
| return __res; |
| } |
| |
| /** |
| * strncmp - Compare two length-limited strings |
| * @cs: One string |
| * @ct: Another string |
| * @count: The maximum number of bytes to compare |
| */ |
| int strncmp(const char * cs,const char * ct,size_t count) |
| { |
| register signed char __res = 0; |
| |
| while (count) { |
| if ((__res = *cs - *ct++) != 0 || !*cs++) |
| break; |
| count--; |
| } |
| |
| return __res; |
| } |
| |
| |
| /** |
| * strchr - Find the first occurrence of a character in a string |
| * @s: The string to be searched |
| * @c: The character to search for |
| */ |
| char * strchr(const char * s, int c) |
| { |
| for(; *s != (char) c; ++s) |
| if (*s == '\0') |
| return NULL; |
| return (char *) s; |
| } |
| |
| /** |
| * strrchr - Find the last occurrence of a character in a string |
| * @s: The string to be searched |
| * @c: The character to search for |
| */ |
| char * strrchr(const char * s, int c) |
| { |
| const char *p = s + strlen(s); |
| do { |
| if (*p == (char)c) |
| return (char *)p; |
| } while (--p >= s); |
| return NULL; |
| } |
| |
| /** |
| * strlen - Find the length of a string |
| * @s: The string to be sized |
| */ |
| size_t strlen(const char * s) |
| { |
| const char *sc; |
| |
| for (sc = s; *sc != '\0'; ++sc) |
| /* nothing */; |
| return sc - s; |
| } |
| |
| /** |
| * strnlen - Find the length of a length-limited string |
| * @s: The string to be sized |
| * @count: The maximum number of bytes to search |
| */ |
| size_t strnlen(const char * s, size_t count) |
| { |
| const char *sc; |
| |
| for (sc = s; count-- && *sc != '\0'; ++sc) |
| /* nothing */; |
| return sc - s; |
| } |
| |
| /** |
| * strpbrk - Find the first occurrence of a set of characters |
| * @cs: The string to be searched |
| * @ct: The characters to search for |
| */ |
| char * strpbrk(const char * cs,const char * ct) |
| { |
| const char *sc1,*sc2; |
| |
| for( sc1 = cs; *sc1 != '\0'; ++sc1) { |
| for( sc2 = ct; *sc2 != '\0'; ++sc2) { |
| if (*sc1 == *sc2) |
| return (char *) sc1; |
| } |
| } |
| return NULL; |
| } |
| |
| /** |
| * strsep - Split a string into tokens |
| * @s: The string to be searched |
| * @ct: The characters to search for |
| * |
| * strsep() updates @s to point after the token, ready for the next call. |
| * |
| * It returns empty tokens, too, behaving exactly like the libc function |
| * of that name. In fact, it was stolen from glibc2 and de-fancy-fied. |
| * Same semantics, slimmer shape. ;) |
| */ |
| char * strsep(char **s, const char *ct) |
| { |
| char *sbegin = *s, *end; |
| |
| if (sbegin == NULL) |
| return NULL; |
| |
| end = strpbrk(sbegin, ct); |
| if (end) |
| *end++ = '\0'; |
| *s = end; |
| |
| return sbegin; |
| } |
| |
| /** |
| * memset - Fill a region of memory with the given value |
| * @s: Pointer to the start of the area. |
| * @c: The byte to fill the area with |
| * @count: The size of the area. |
| * |
| * Do not use memset() to access IO space, use memset_io() instead. |
| */ |
| void * memset(void * s,int c,size_t count) |
| { |
| char *xs = (char *) s; |
| |
| while (count--) |
| *xs++ = c; |
| |
| return s; |
| } |
| |
| /** |
| * memcpy - Copy one area of memory to another |
| * @dest: Where to copy to |
| * @src: Where to copy from |
| * @count: The size of the area. |
| * |
| * You should not use this function to access IO space, use memcpy_toio() |
| * or memcpy_fromio() instead. |
| */ |
| void * memcpy(void * dest,const void *src,size_t count) |
| { |
| char *tmp = (char *) dest, *s = (char *) src; |
| |
| while (count--) |
| *tmp++ = *s++; |
| |
| return dest; |
| } |
| |
| /** |
| * memmove - Copy one area of memory to another |
| * @dest: Where to copy to |
| * @src: Where to copy from |
| * @count: The size of the area. |
| * |
| * Unlike memcpy(), memmove() copes with overlapping areas. |
| */ |
| void * memmove(void * dest,const void *src,size_t count) |
| { |
| char *tmp, *s; |
| |
| if (dest <= src) { |
| tmp = (char *) dest; |
| s = (char *) src; |
| while (count--) |
| *tmp++ = *s++; |
| } |
| else { |
| tmp = (char *) dest + count; |
| s = (char *) src + count; |
| while (count--) |
| *--tmp = *--s; |
| } |
| |
| return dest; |
| } |
| |
| /** |
| * memcmp - Compare two areas of memory |
| * @cs: One area of memory |
| * @ct: Another area of memory |
| * @count: The size of the area. |
| */ |
| int memcmp(const void * cs,const void * ct,size_t count) |
| { |
| const unsigned char *su1, *su2; |
| int res = 0; |
| |
| for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--) |
| if ((res = *su1 - *su2) != 0) |
| break; |
| return res; |
| } |
| |
| char * |
| strdup( const char *str ) |
| { |
| char *p; |
| if( !str ) |
| return NULL; |
| p = malloc( strlen(str) + 1 ); |
| strcpy( p, str ); |
| return p; |
| } |
| |
| int |
| strcasecmp( const char *cs, const char *ct ) |
| { |
| register signed char __res; |
| |
| while (1) { |
| char ch1 = toupper(*cs), ch2 = toupper(*ct); |
| ct++; |
| if ((__res = ch1 - ch2) != 0 || !*cs++) |
| break; |
| } |
| return __res; |
| } |
| |
| int |
| strncasecmp( const char *cs, const char *ct, size_t count ) |
| { |
| register signed char __res = 0; |
| |
| while (count--) { |
| char ch1 = toupper(*cs), ch2 = toupper(*ct); |
| ct++; |
| if ((__res = ch1 - ch2) != 0 || !*cs++) |
| break; |
| } |
| return __res; |
| } |
| |