u_string.h revision 9fb46fb4c30fe01c9cb485f909aca502691aaa3b 
1/**************************************************************************
2 *
3 * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28/**
29 * @file
30 * Platform independent functions for string manipulation.
31 *
32 * @author Jose Fonseca <jrfonseca@tungstengraphics.com>
33 */
34
35#ifndef U_STRING_H_
36#define U_STRING_H_
37
38#if !defined(WIN32) && !defined(XF86_LIBC_H)
39#include <stdio.h>
40#endif
41#include <stddef.h>
42#include <stdarg.h>
43
44#include "pipe/p_compiler.h"
45
46
47#ifdef __cplusplus
48extern "C" {
49#endif
50
51
52#ifdef WIN32
53
54int util_vsnprintf(char *, size_t, const char *, va_list);
55int util_snprintf(char *str, size_t size, const char *format, ...);
56
57static INLINE void
58util_vsprintf(char *str, const char *format, va_list ap)
59{
60   util_vsnprintf(str, (size_t)-1, format, ap);
61}
62
63static INLINE void
64util_sprintf(char *str, const char *format, ...)
65{
66   va_list ap;
67   va_start(ap, format);
68   util_vsnprintf(str, (size_t)-1, format, ap);
69   va_end(ap);
70}
71
72static INLINE char *
73util_strchr(const char *s, char c)
74{
75   while(*s) {
76      if(*s == c)
77	 return (char *)s;
78      ++s;
79   }
80   return NULL;
81}
82
83static INLINE char*
84util_strncat(char *dst, const char *src, size_t n)
85{
86   char *p = dst + strlen(dst);
87   const char *q = src;
88   size_t i;
89
90   for (i = 0; i < n && *q != '\0'; ++i)
91       *p++ = *q++;
92   *p = '\0';
93
94   return dst;
95}
96
97static INLINE int
98util_strcmp(const char *s1, const char *s2)
99{
100   unsigned char u1, u2;
101
102   while (1) {
103      u1 = (unsigned char) *s1++;
104      u2 = (unsigned char) *s2++;
105      if (u1 != u2)
106	 return u1 - u2;
107      if (u1 == '\0')
108	 return 0;
109   }
110   return 0;
111}
112
113static INLINE int
114util_strncmp(const char *s1, const char *s2, size_t n)
115{
116   unsigned char u1, u2;
117
118   while (n-- > 0) {
119      u1 = (unsigned char) *s1++;
120      u2 = (unsigned char) *s2++;
121      if (u1 != u2)
122	 return u1 - u2;
123      if (u1 == '\0')
124	 return 0;
125   }
126   return 0;
127}
128
129static INLINE char *
130util_strstr(const char *haystack, const char *needle)
131{
132   const char *p = haystack;
133   size_t len = strlen(needle);
134
135   for (; (p = util_strchr(p, *needle)) != 0; p++) {
136      if (util_strncmp(p, needle, len) == 0) {
137	 return (char *)p;
138      }
139   }
140   return NULL;
141}
142
143static INLINE void *
144util_memmove(void *dest, const void *src, size_t n)
145{
146   char *p = (char *)dest;
147   const char *q = (const char *)src;
148   if (dest < src) {
149      while (n--)
150	 *p++ = *q++;
151   }
152   else
153   {
154      p += n;
155      q += n;
156      while (n--)
157	 *--p = *--q;
158   }
159   return dest;
160}
161
162
163#else
164
165#define util_vsnprintf vsnprintf
166#define util_snprintf snprintf
167#define util_vsprintf vsprintf
168#define util_sprintf sprintf
169#define util_strchr strchr
170#define util_strcmp strcmp
171#define util_strncmp strncmp
172#define util_strncat strncat
173#define util_strstr strstr
174#define util_memmove memmove
175
176#endif
177
178
179/**
180 * Printable string buffer
181 */
182struct util_strbuf
183{
184   char *str;
185   char *ptr;
186   size_t left;
187};
188
189
190static INLINE void
191util_strbuf_init(struct util_strbuf *sbuf, char *str, size_t size)
192{
193   sbuf->str = str;
194   sbuf->str[0] = 0;
195   sbuf->ptr = sbuf->str;
196   sbuf->left = size;
197}
198
199
200static INLINE void
201util_strbuf_printf(struct util_strbuf *sbuf, const char *format, ...)
202{
203   if(sbuf->left > 1) {
204      size_t written;
205      va_list ap;
206      va_start(ap, format);
207      written = util_vsnprintf(sbuf->ptr, sbuf->left, format, ap);
208      va_end(ap);
209      sbuf->ptr += written;
210      sbuf->left -= written;
211   }
212}
213
214
215
216#ifdef __cplusplus
217}
218#endif
219
220#endif /* U_STRING_H_ */
221