src/util/u_string.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 VMware, Inc.
   4  * All Rights Reserved.
   5  *
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   7  * copy of this software and associated documentation files (the
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   9  * without limitation the rights to use, copy, modify, merge, publish,
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  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 VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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  25  *
  26  **************************************************************************/
  27
  28 /**
  29  * @file
  30  * Platform independent functions for string manipulation.
  31  *
  32  * @author Jose Fonseca <jfonseca@vmware.com>
  33  */
  34
  35 #ifndef U_STRING_H_
  36 #define U_STRING_H_
  37
  38 #if !defined(XF86_LIBC_H)
  39 #include <stdio.h>
  40 #endif
  41 #include <stdlib.h>
  42 #include <stddef.h>
  43 #include <stdarg.h>
  44 #include <string.h>
  45
  46 #include "util/macros.h" // PRINTFLIKE
  47
  48
  49 #ifdef __cplusplus
  50 extern "C" {
  51 #endif
  52
  53 #ifdef _GNU_SOURCE
  54
  55 #define util_strchrnul strchrnul
  56
  57 #else
  58
  59 static inline char *
  60 util_strchrnul(const char *s, char c)
  61 {
  62    for (; *s && *s != c; ++s);
  63
  64    return (char *)s;
  65 }
  66
  67 #endif
  68
  69 #ifdef _WIN32
  70
  71 static inline int
  72 util_vsnprintf(char *str, size_t size, const char *format, va_list ap)
  73 {
  74    /* We need to use _vscprintf to calculate the length as vsnprintf returns -1
  75     * if the number of characters to write is greater than count.
  76     */
  77    va_list ap_copy;
  78    int ret;
  79    va_copy(ap_copy, ap);
  80    ret = _vsnprintf(str, size, format, ap);
  81    if (ret < 0) {
  82       ret = _vscprintf(format, ap_copy);
  83    }
  84    va_end(ap_copy);
  85    return ret;
  86 }
  87
  88 static inline int
  89    PRINTFLIKE(3, 4)
  90 util_snprintf(char *str, size_t size, const char *format, ...)
  91 {
  92    va_list ap;
  93    int ret;
  94    va_start(ap, format);
  95    ret = util_vsnprintf(str, size, format, ap);
  96    va_end(ap);
  97    return ret;
  98 }
  99
 100 static inline void
 101    PRINTFLIKE(2, 3)
 102 util_sprintf(char *str, const char *format, ...)
 103 {
 104    va_list ap;
 105    va_start(ap, format);
 106    util_vsnprintf(str, (size_t)-1, format, ap);
 107    va_end(ap);
 108 }
 109
 110 static inline int
 111 util_vasprintf(char **ret, const char *format, va_list ap)
 112 {
 113    va_list ap_copy;
 114
 115    /* Compute length of output string first */
 116    va_copy(ap_copy, ap);
 117    int r = util_vsnprintf(NULL, 0, format, ap_copy);
 118    va_end(ap_copy);
 119
 120    if (r < 0)
 121       return -1;
 122
 123    *ret = (char *) malloc(r + 1);
 124    if (!*ret)
 125       return -1;
 126
 127    /* Print to buffer */
 128    return util_vsnprintf(*ret, r + 1, format, ap);
 129 }
 130
 131 static inline char*
 132 util_strncat(char *dst, const char *src, size_t n)
 133 {
 134    char *p = dst + strlen(dst);
 135    const char *q = src;
 136    size_t i;
 137
 138    for (i = 0; i < n && *q != '\0'; ++i)
 139        *p++ = *q++;
 140    *p = '\0';
 141
 142    return dst;
 143 }
 144
 145 static inline int
 146 util_strcmp(const char *s1, const char *s2)
 147 {
 148    unsigned char u1, u2;
 149
 150    while (1) {
 151       u1 = (unsigned char) *s1++;
 152       u2 = (unsigned char) *s2++;
 153       if (u1 != u2)
 154          return u1 - u2;
 155       if (u1 == '\0')
 156          return 0;
 157    }
 158    return 0;
 159 }
 160
 161 static inline int
 162 util_strncmp(const char *s1, const char *s2, size_t n)
 163 {
 164    unsigned char u1, u2;
 165
 166    while (n-- > 0) {
 167       u1 = (unsigned char) *s1++;
 168       u2 = (unsigned char) *s2++;
 169       if (u1 != u2)
 170          return u1 - u2;
 171       if (u1 == '\0')
 172          return 0;
 173    }
 174    return 0;
 175 }
 176
 177
 178
 179 #define util_strcasecmp stricmp
 180 #define util_strdup _strdup
 181
 182 #else
 183
 184 #define util_vsnprintf vsnprintf
 185 #define util_snprintf snprintf
 186 #define util_vasprintf vasprintf
 187 #define util_sprintf sprintf
 188 #define util_strcmp strcmp
 189 #define util_strncmp strncmp
 190 #define util_strncat strncat
 191 #define util_strcasecmp strcasecmp
 192 #define util_strdup strdup
 193
 194 #endif
 195
 196
 197 #ifdef __cplusplus
 198 }
 199 #endif
 200
 201 #endif /* U_STRING_H_ */