3 * Copyright (c) 2001,2003,2004 David H. Hovemeyer <daveho@cs.umd.edu>
4 * Copyright (c) 2003, Jeffrey K. Hollingsworth <hollings@cs.umd.edu>
6 * Permission is hereby granted, free of charge, to any person
7 * obtaining a copy of this software and associated documentation
8 * files (the "Software"), to deal in the Software without restriction,
9 * including without limitation the rights to use, copy, modify, merge,
10 * publish, distribute, sublicense, and/or sell copies of the Software,
11 * and to permit persons to whom the Software is furnished to do so,
12 * subject to the following conditions:
14 * The above copyright notice and this permission notice shall be
15 * included in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
18 * ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
19 * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
20 * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
21 * SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
22 * FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
23 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
24 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
25 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 /* Modifications by Jack Lange <jarusl@cs.northwestern.edu> */
33 * These are slow and simple implementations of a subset of
34 * the standard C library string functions.
35 * We also have an implementation of snprintf().
39 #include <palacios/vmm_string.h>
40 #include <palacios/vmm.h>
44 static float e = 0.00000001;
46 double ceil(double x) {
47 if ((double)(x - (int)x) == 0) {
50 return (int)(x + e) + 1;
54 void* memset(void* s, int c, size_t n)
56 unsigned char* p = (unsigned char*) s;
59 *p++ = (unsigned char) c;
67 void* memcpy(void *dst, const void* src, size_t n)
69 unsigned char* d = (unsigned char*) dst;
70 const unsigned char* s = (const unsigned char*) src;
81 int memcmp(const void *s1_, const void *s2_, size_t n)
83 const signed char *s1 = s1_, *s2 = s2_;
96 size_t strlen(const char* s)
105 * This it a GNU extension.
106 * It is like strlen(), but it will check at most maxlen
107 * characters for the terminating nul character,
108 * returning maxlen if it doesn't find a nul.
109 * This is very useful for checking the length of untrusted
110 * strings (e.g., from user space).
112 size_t strnlen(const char *s, size_t maxlen)
115 while (len < maxlen && *s++ != '\0')
120 int strcmp(const char* s1, const char* s2)
124 if (cmp != 0 || *s1 == '\0' || *s2 == '\0')
131 int strncmp(const char* s1, const char* s2, size_t limit)
136 if (cmp != 0 || *s1 == '\0' || *s2 == '\0')
143 /* limit reached and equal */
147 char *strcat(char *s1, const char *s2)
153 while(*s2) *s1++ = *s2++;
159 char *strcpy(char *dest, const char *src)
171 char *strncpy(char *dest, const char *src, size_t limit)
175 while (*src != '\0' && limit > 0) {
185 char *strdup(const char *s1)
189 ret = V3_Malloc(strlen(s1) + 1);
195 int atoi(const char *buf)
199 while (*buf >= '0' && *buf <= '9') {
208 char *strchr(const char *s, int c)
218 char *strrchr(const char *s, int c)
220 size_t len = strlen(s);
221 const char *p = s + len;
231 char *strpbrk(const char *s, const char *accept)
233 size_t setLen = strlen(accept);
237 for (i = 0; i < setLen; ++i) {