src/gallium/auxiliary/util/u_string.h

   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
  48 extern "C" {
  49 #endif
  50
  51
  52 #ifdef WIN32
  53
  54 int util_vsnprintf(char *, size_t, const char *, va_list);
  55 int util_snprintf(char *str, size_t size, const char *format, ...);
  56
  57 static INLINE void
  58 util_vsprintf(char *str, const char *format, va_list ap)
  59 {
  60    util_vsnprintf(str, (size_t)-1, format, ap);
  61 }
  62
  63 static INLINE void
  64 util_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
  72 static INLINE char *
  73 util_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
  83 static INLINE char*
  84 util_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
  97 static INLINE int
  98 util_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
 113 static INLINE int
 114 util_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
 129 static INLINE char *
 130 util_strstr(const char *haystack, const char *needle)
 131 {
 132    const char *p = haystack;
 133    int 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
 143 static INLINE void *
 144 util_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  */
 182 struct util_strbuf
 183 {
 184    char *str;
 185    char *ptr;
 186    size_t left;
 187 };
 188
 189
 190 static INLINE void
 191 util_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
 200 static INLINE void
 201 util_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_ */