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[/] [openrisc/] [trunk/] [bootloaders/] [orpmon/] [common/] [string.c] - Rev 397
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/* string.h -- String manipulation Implements (some) of the standard string routines Copyright (C) 2002 Richard Herveille, rherveille@opencores.org This file is part of OpenRISC 1000 Reference Platform Monitor (ORPmon) This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <stddef.h> #include "string.h" /* Basic string functions */ /* s t r l e n returns number of characters in s (not including terminating null character) */ size_t strlen(const char *s) { size_t cnt = 0; /* count the length of string s, not including the \0 character */ while (*s++) cnt++; return cnt; } /* s t r c p y Copy 'src' to 'dest'. Strings may not overlap. */ char *strcpy(char *dest, const char *src) { char *d = dest; /* copy src to dest */ while ( (*dest++ = *src++) ) ; return d; } char *strncpy(char *dest, const char *src, size_t n) { char *d = dest; /* copy src to dest */ while ( *src && n ) { *dest++ = *src++; n--; } /* fill the remainder of d with nulls */ while (n--) *dest++ = '\0'; return d; } char *strcat(char *dest, const char *src) { char *d = dest; /* find the end of the destination string */ while (*dest++) ; /* append the source string to the destination string */ while ( (*dest++ = *src++) ) ; return d; } char *strncat(char *dest, const char *src, size_t n) { char *d = dest; /* find the end of the destination string */ while (*dest++) ; /* copy src to dest */ while ( (*dest = *src) && n-- ) { dest++; src++; } /* add terminating '\0' character */ *dest = '\0'; return d; } int strcmp(const char *s1, const char *s2) { while ( *s1 && (*s1 == *s2) ) { s1++; s2++; } return *s1 - *s2; } int strncmp(const char *s1, const char *s2, size_t n) { while ( *s1 && (*s1 == *s2) && n-- ) { s1++; s2++; } return *s1 - *s2; } char *strchr(const char *s, int c) { /* search for the character c */ while (*s && (*s != c) ) s++; return (char *)s; } char *strrchr(const char *s, int c) { char *fnd = NULL; /* search for the character c */ while (*s) { if (*s == c) fnd = (char *)s; s++; } return fnd; } /* Basic mem functions */ void *memcpy(void *dest, const void *src, size_t n) { /* check if 'src' and 'dest' are on LONG boundaries */ if ( (sizeof(unsigned long) -1) & ((unsigned long)dest | (unsigned long)src) ) { /* no, do a byte-wide copy */ char *cs = (char *) src; char *cd = (char *) dest; while (n--) *cd++ = *cs++; } else { /* yes, speed up copy process */ /* copy as many LONGs as possible */ long *ls = (long *)src; long *ld = (long *)dest; size_t cnt = n >> 2; while (cnt--) *ld++ = *ls++; /* finally copy the remaining bytes */ char *cs = (char *) (src + (n & ~0x03)); char *cd = (char *) (dest + (n & ~0x03)); cnt = n & 0x3; while (cnt--) *cd++ = *cs++; } return dest; } /* memcpy, return checksum of bytes copied instead of pointer to dest */ unsigned char memcpy_crc(void *dest, const void *src, size_t n) { unsigned char sum = 0; unsigned char tmp; char *cs = (char *) src; char *cd = (char *) dest; while (n--) { tmp = *cs++; sum += tmp; *cd++ = tmp; } return sum; } void *memmove(void *dest, void *src, size_t n) { char *d = dest; char *s = src; while (n--) *d++ = *s++; return dest; } int memcmp(const void *s1, const void *s2, size_t n) { char *p1 = (void *)s1; char *p2 = (void *)s2; while ( (*p1 == *p2) && n-- ) { p1++; p2++; } return *p1 - *p2; } void *memchr(const void *s, char c, size_t n) { char *p = (void *)s; /* search for the character c */ while ( (*p != c) && n-- ) p++; return (*p == c) ? p : NULL; } void *memset(void *s, int c, size_t n) { char *p = s; while (n--) *p++ = c; return s; }
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