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Diffstat (limited to 'tboot/string.c')
| -rw-r--r-- | tboot/string.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/tboot/string.c b/tboot/string.c new file mode 100644 index 0000000..d30998e --- /dev/null +++ b/tboot/string.c @@ -0,0 +1,204 @@ +/*- + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ +/* + * From: FreeBSD sys/libkern/strlen.c + * From: FreeBSD sys/libkern/strcmp.c + * From: FreeBSD sys/libkern/strncmp.c + * From: FreeBSD sys/libkern/strncpy.c + * From: FreeBSD: sys/libkern/index.c + */ +/* $FreeBSD: src/sys/libkern/strtoul.c,v 1.6.32.1 2010/02/10 00:26:20 kensmith Exp $ */ +/* $FreeBSD: src/sys/libkern/memcmp.c,v 1.1 2008/09/23 14:45:10 obrien Exp $ */ + +#include <config.h> +#include <efibase.h> +#include <ctype.h> +#include <string.h> + +size_t strlen(str) + const char *str; +{ + register const char *s; + + for (s = str; *s; ++s); + return(s - str); +} + +/* + * Compare strings. + */ +int strcmp(s1, s2) + register const char *s1, *s2; +{ + while (*s1 == *s2++) + if (*s1++ == 0) + return (0); + return (*(const unsigned char *)s1 - *(const unsigned char *)(s2 - 1)); +} + +int strncmp(s1, s2, n) + register const char *s1, *s2; + register size_t n; +{ + + if (n == 0) + return (0); + do { + if (*s1 != *s2++) + return (*(const unsigned char *)s1 - + *(const unsigned char *)(s2 - 1)); + if (*s1++ == 0) + break; + } while (--n != 0); + return (0); +} + +/* + * Copy src to dst, truncating or null-padding to always copy n bytes. + * Return dst. + */ +char *strncpy(char * __restrict dst, const char * __restrict src, size_t n) +{ + if (n != 0) { + register char *d = dst; + register const char *s = src; + + do { + if ((*d++ = *s++) == 0) { + /* NUL pad the remaining n-1 bytes */ + while (--n != 0) + *d++ = 0; + break; + } + } while (--n != 0); + } + return (dst); +} + +#define ULONG_MAX 0xFFFFFFFFUL + +/* + * Convert a string to an unsigned long integer. + * + * Ignores `locale' stuff. Assumes that the upper and lower case + * alphabets and digits are each contiguous. + */ +unsigned long strtoul(const char *nptr, char **endptr, int base) +{ + const char *s = nptr; + unsigned long acc; + unsigned char c; + unsigned long cutoff; + int neg = 0, any, cutlim; + + /* + * See strtol for comments as to the logic used. + */ + do { + c = *s++; + } while (isspace(c)); + if (c == '-') { + neg = 1; + c = *s++; + } else if (c == '+') + c = *s++; + if ((base == 0 || base == 16) && + c == '0' && (*s == 'x' || *s == 'X')) { + c = s[1]; + s += 2; + base = 16; + } + if (base == 0) + base = c == '0' ? 8 : 10; + cutoff = (unsigned long)ULONG_MAX / (unsigned long)base; + cutlim = (unsigned long)ULONG_MAX % (unsigned long)base; + for (acc = 0, any = 0;; c = *s++) { + if (isdigit(c)) + c -= '0'; + else if (isalpha(c)) + c -= isupper(c) ? 'A' - 10 : 'a' - 10; + else + break; + if (c >= base) + break; + if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) + any = -1; + else { + any = 1; + acc *= base; + acc += c; + } + } + if (any < 0) { + acc = ULONG_MAX; + } else if (neg) + acc = -acc; + if (endptr != 0) + *((const char **)endptr) = any ? s - 1 : nptr; + return (acc); +} + +/* + * index() is also present as the strchr() in the kernel; it does exactly the + * same thing as it's userland equivalent. + */ +char *index(p, ch) + const char *p; + int ch; +{ + union { + const char *cp; + char *p; + } u; + + u.cp = p; + for (;; ++u.p) { + if (*u.p == ch) + return(u.p); + if (*u.p == '\0') + return(NULL); + } + /* NOTREACHED */ +} + +/* + * Compare memory regions. + */ +int memcmp(const void *s1, const void *s2, size_t n) +{ + if (n != 0) { + const unsigned char *p1 = s1, *p2 = s2; + + do { + if (*p1++ != *p2++) + return (*--p1 - *--p2); + } while (--n != 0); + } + return (0); +} |