src/util/u_string.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 VMware, Inc.
   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 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
  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 <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 #ifndef _GNU_SOURCE
  54
  55 #define strchrnul util_strchrnul
  56 static inline char *
  57 util_strchrnul(const char *s, char c)
  58 {
  59    for (; *s && *s != c; ++s);
  60
  61    return (char *)s;
  62 }
  63
  64 #endif
  65
  66 #ifdef _WIN32
  67
  68 static inline int
  69 util_vsnprintf(char *str, size_t size, const char *format, va_list ap)
  70 {
  71    /* We need to use _vscprintf to calculate the length as vsnprintf returns -1
  72     * if the number of characters to write is greater than count.
  73     */
  74    va_list ap_copy;
  75    int ret;
  76    va_copy(ap_copy, ap);
  77    ret = _vsnprintf(str, size, format, ap);
  78    if (ret < 0) {
  79       ret = _vscprintf(format, ap_copy);
  80    }
  81    va_end(ap_copy);
  82    return ret;
  83 }
  84
  85 static inline int
  86    PRINTFLIKE(3, 4)
  87 util_snprintf(char *str, size_t size, const char *format, ...)
  88 {
  89    va_list ap;
  90    int ret;
  91    va_start(ap, format);
  92    ret = util_vsnprintf(str, size, format, ap);
  93    va_end(ap);
  94    return ret;
  95 }
  96
  97 static inline void
  98    PRINTFLIKE(2, 3)
  99 util_sprintf(char *str, const char *format, ...)
 100 {
 101    va_list ap;
 102    va_start(ap, format);
 103    util_vsnprintf(str, (size_t)-1, format, ap);
 104    va_end(ap);
 105 }
 106
 107 static inline int
 108 util_vasprintf(char **ret, const char *format, va_list ap)
 109 {
 110    va_list ap_copy;
 111
 112    /* Compute length of output string first */
 113    va_copy(ap_copy, ap);
 114    int r = util_vsnprintf(NULL, 0, format, ap_copy);
 115    va_end(ap_copy);
 116
 117    if (r < 0)
 118       return -1;
 119
 120    *ret = (char *) malloc(r + 1);
 121    if (!*ret)
 122       return -1;
 123
 124    /* Print to buffer */
 125    return util_vsnprintf(*ret, r + 1, format, ap);
 126 }
 127
 128 #define strncat util_strncat
 129 static inline char*
 130 util_strncat(char *dst, const char *src, size_t n)
 131 {
 132    char *p = dst + strlen(dst);
 133    const char *q = src;
 134    size_t i;
 135
 136    for (i = 0; i < n && *q != '\0'; ++i)
 137        *p++ = *q++;
 138    *p = '\0';
 139
 140    return dst;
 141 }
 142
 143 #define strcmp util_strcmp
 144 static inline int
 145 util_strcmp(const char *s1, const char *s2)
 146 {
 147    unsigned char u1, u2;
 148
 149    while (1) {
 150       u1 = (unsigned char) *s1++;
 151       u2 = (unsigned char) *s2++;
 152       if (u1 != u2)
 153          return u1 - u2;
 154       if (u1 == '\0')
 155          return 0;
 156    }
 157    return 0;
 158 }
 159
 160 #define strncmp util_strncmp
 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 strcasecmp stricmp
 180 #define 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
 189 #endif
 190
 191
 192 #ifdef __cplusplus
 193 }
 194 #endif
 195
 196 #endif /* U_STRING_H_ */