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
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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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  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 #define vsnprintf util_vsnprintf
  69 static inline int
  70 util_vsnprintf(char *str, size_t size, const char *format, va_list ap)
  71 {
  72    /* We need to use _vscprintf to calculate the length as vsnprintf returns -1
  73     * if the number of characters to write is greater than count.
  74     */
  75    va_list ap_copy;
  76    int ret;
  77    va_copy(ap_copy, ap);
  78    ret = _vsnprintf(str, size, format, ap);
  79    if (ret < 0) {
  80       ret = _vscprintf(format, ap_copy);
  81    }
  82    va_end(ap_copy);
  83    return ret;
  84 }
  85
  86 #define snprintf util_snprintf
  87 static inline int
  88    PRINTFLIKE(3, 4)
  89 util_snprintf(char *str, size_t size, const char *format, ...)
  90 {
  91    va_list ap;
  92    int ret;
  93    va_start(ap, format);
  94    ret = vsnprintf(str, size, format, ap);
  95    va_end(ap);
  96    return ret;
  97 }
  98
  99 #define sprintf util_sprintf
 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    vsnprintf(str, (size_t)-1, format, ap);
 107    va_end(ap);
 108 }
 109
 110 #define vasprintf util_vasprintf
 111 static inline int
 112 util_vasprintf(char **ret, const char *format, va_list ap)
 113 {
 114    va_list ap_copy;
 115
 116    /* Compute length of output string first */
 117    va_copy(ap_copy, ap);
 118    int r = vsnprintf(NULL, 0, format, ap_copy);
 119    va_end(ap_copy);
 120
 121    if (r < 0)
 122       return -1;
 123
 124    *ret = (char *) malloc(r + 1);
 125    if (!*ret)
 126       return -1;
 127
 128    /* Print to buffer */
 129    return vsnprintf(*ret, r + 1, format, ap);
 130 }
 131
 132 #define strncat util_strncat
 133 static inline char*
 134 util_strncat(char *dst, const char *src, size_t n)
 135 {
 136    char *p = dst + strlen(dst);
 137    const char *q = src;
 138    size_t i;
 139
 140    for (i = 0; i < n && *q != '\0'; ++i)
 141        *p++ = *q++;
 142    *p = '\0';
 143
 144    return dst;
 145 }
 146
 147 #define strcmp util_strcmp
 148 static inline int
 149 util_strcmp(const char *s1, const char *s2)
 150 {
 151    unsigned char u1, u2;
 152
 153    while (1) {
 154       u1 = (unsigned char) *s1++;
 155       u2 = (unsigned char) *s2++;
 156       if (u1 != u2)
 157          return u1 - u2;
 158       if (u1 == '\0')
 159          return 0;
 160    }
 161    return 0;
 162 }
 163
 164 #define strncmp util_strncmp
 165 static inline int
 166 util_strncmp(const char *s1, const char *s2, size_t n)
 167 {
 168    unsigned char u1, u2;
 169
 170    while (n-- > 0) {
 171       u1 = (unsigned char) *s1++;
 172       u2 = (unsigned char) *s2++;
 173       if (u1 != u2)
 174          return u1 - u2;
 175       if (u1 == '\0')
 176          return 0;
 177    }
 178    return 0;
 179 }
 180
 181
 182
 183 #define strcasecmp stricmp
 184 #define strdup _strdup
 185
 186 #endif
 187
 188
 189 #ifdef __cplusplus
 190 }
 191 #endif
 192
 193 #endif /* U_STRING_H_ */