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Diffstat (limited to 'mini-os/lib/string.c')
-rw-r--r-- | mini-os/lib/string.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/mini-os/lib/string.c b/mini-os/lib/string.c new file mode 100644 index 0000000000..c1b9dbfc8e --- /dev/null +++ b/mini-os/lib/string.c @@ -0,0 +1,142 @@ +/* -*- Mode:C; c-basic-offset:4; tab-width:4 -*- + **************************************************************************** + * (C) 2003 - Rolf Neugebauer - Intel Research Cambridge + **************************************************************************** + * + * File: string.c + * Author: Rolf Neugebauer (neugebar@dcs.gla.ac.uk) + * Changes: + * + * Date: Aug 2003 + * + * Environment: Xen Minimal OS + * Description: Library function for string and memory manipulation + * Origin unknown + * + **************************************************************************** + * $Id: c-insert.c,v 1.7 2002/11/08 16:04:34 rn Exp $ + **************************************************************************** + */ + +#include <os.h> +#include <types.h> +#include <lib.h> + +int memcmp(const void * cs,const void * ct,size_t count) +{ + const unsigned char *su1, *su2; + signed char res = 0; + + for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--) + if ((res = *su1 - *su2) != 0) + break; + return res; +} + +void * memcpy(void * dest,const void *src,size_t count) +{ + char *tmp = (char *) dest, *s = (char *) src; + + while (count--) + *tmp++ = *s++; + + return dest; +} + +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; +} + +int strcmp(const char * cs,const char * ct) +{ + register signed char __res; + + while (1) { + if ((__res = *cs - *ct++) != 0 || !*cs++) + break; + } + + return __res; +} + +char * strcpy(char * dest,const char *src) +{ + char *tmp = dest; + + while ((*dest++ = *src++) != '\0') + /* nothing */; + return tmp; +} + +char * strncpy(char * dest,const char *src,size_t count) +{ + char *tmp = dest; + + while (count-- && (*dest++ = *src++) != '\0') + /* nothing */; + + return tmp; +} + +void * memset(void * s,int c,size_t count) +{ + char *xs = (char *) s; + + while (count--) + *xs++ = c; + + return s; +} + +size_t strnlen(const char * s, size_t count) +{ + const char *sc; + + for (sc = s; count-- && *sc != '\0'; ++sc) + /* nothing */; + return sc - s; +} + +size_t strlen(const char * s) +{ + const char *sc; + + for (sc = s; *sc != '\0'; ++sc) + /* nothing */; + return sc - s; +} + +char * strchr(const char * s, int c) +{ + for(; *s != (char) c; ++s) + if (*s == '\0') + return NULL; + return (char *) s; +} + +char * strstr(const char * s1,const char * s2) +{ + int l1, l2; + + l2 = strlen(s2); + if (!l2) + return (char *) s1; + l1 = strlen(s1); + while (l1 >= l2) { + l1--; + if (!memcmp(s1,s2,l2)) + return (char *) s1; + s1++; + } + return NULL; +} + |