Mercurial > hg > th-libs
annotate th_string.c @ 223:d58b92ef5c03
Improve documentation.
author | Matti Hamalainen <ccr@tnsp.org> |
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date | Mon, 15 Feb 2016 10:46:45 +0200 |
parents | 723a69185102 |
children | 128c8cb80205 |
rev | line source |
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1 /* |
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2 * Miscellaneous string-handling related utility-functions |
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3 * Programmed and designed by Matti 'ccr' Hamalainen |
144 | 4 * (C) Copyright 2002-2015 Tecnic Software productions (TNSP) |
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5 * |
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6 * Please read file 'COPYING' for information on license and distribution. |
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7 */ |
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8 #include "th_util.h" |
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9 #include "th_string.h" |
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10 |
80 | 11 |
12 /* Implementation of strdup() with a NULL check | |
8 | 13 */ |
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14 char *th_strdup(const char *src) |
8 | 15 { |
10 | 16 char *res; |
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17 if (src == NULL) |
10 | 18 return NULL; |
44 | 19 |
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20 if ((res = th_malloc(strlen(src) + 1)) == NULL) |
10 | 21 return NULL; |
44 | 22 |
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23 strcpy(res, src); |
10 | 24 return res; |
8 | 25 } |
26 | |
27 | |
81 | 28 /* Implementation of strndup() with NULL check |
29 */ | |
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30 char *th_strndup(const char *src, const size_t n) |
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31 { |
81 | 32 char *res; |
33 size_t len; | |
79 | 34 |
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35 if (src == NULL) |
81 | 36 return NULL; |
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37 |
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38 len = strlen(src); |
81 | 39 if (len > n) |
40 len = n; | |
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41 |
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42 if ((res = th_malloc(len + 1)) == NULL) |
81 | 43 return NULL; |
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44 |
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45 memcpy(res, src, len); |
81 | 46 res[len] = 0; |
47 | |
48 return res; | |
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49 } |
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50 |
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51 |
223 | 52 /* Like strdup, but trims whitespace from the string according to specified flags. |
53 * See TH_TRIM_* in th_string.h. If the resulting string would be empty (length 0), | |
54 * NULL is returned. | |
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55 */ |
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56 static inline char * th_strdup_trim_do(const char *src, size_t len, const int flags) |
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57 { |
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58 char *res; |
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59 size_t start, end; |
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60 |
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61 if (len == 0) |
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62 return NULL; |
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63 |
174 | 64 // Trim start: find first non-whitespace character |
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65 if (flags & TH_TRIM_START) |
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66 for (start = 0; start < len && th_isspace(src[start]); start++); |
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67 else |
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68 start = 0; |
174 | 69 |
70 // Trim end: find last non-whitespace character | |
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71 if (flags & TH_TRIM_END) |
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72 for (end = len; end > start && th_isspace(src[end]); end--); |
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73 else |
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74 end = len; |
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75 |
174 | 76 // Allocate memory for result |
222
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77 len = end - start; |
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78 if (len == 0) |
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79 return NULL; |
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80 |
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81 if ((res = th_malloc(len + 1)) == NULL) |
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82 return NULL; |
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83 |
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84 memcpy(res, src, len); |
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85 res[len] = 0; |
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86 return res; |
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87 } |
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88 |
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89 |
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90 char *th_strdup_trim(const char *src, const int flags) |
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91 { |
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92 if (src == NULL) |
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93 return NULL; |
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94 |
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95 return th_strdup_trim_do(src, strlen(src), flags); |
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96 } |
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97 |
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98 |
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99 char *th_strndup_trim(const char *src, const size_t n, const int flags) |
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100 { |
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101 size_t len; |
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102 if (src == NULL || n == 0) |
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103 return NULL; |
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104 |
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105 for (len = 0; len < n && src[len]; len++); |
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106 |
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107 return th_strdup_trim_do(src, len, flags); |
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108 } |
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109 |
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110 |
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111 /* Simulate a sprintf() that allocates memory |
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112 */ |
43 | 113 char *th_strdup_vprintf(const char *fmt, va_list args) |
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114 { |
133 | 115 int size = 64; |
116 char *buf, *tmp; | |
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117 |
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118 if ((buf = th_malloc(size)) == NULL) |
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119 return NULL; |
44 | 120 |
39 | 121 while (1) |
122 { | |
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123 int n; |
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124 va_list ap; |
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125 va_copy(ap, args); |
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126 n = vsnprintf(buf, size, fmt, ap); |
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127 va_end(ap); |
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128 |
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129 if (n > -1 && n < size) |
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130 return buf; |
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131 if (n > -1) |
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132 size = n + 1; |
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133 else |
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134 size *= 2; |
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135 |
133 | 136 if ((tmp = th_realloc(buf, size)) == NULL) |
137 { | |
138 th_free(buf); | |
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139 return NULL; |
133 | 140 } |
141 else | |
142 buf = tmp; | |
10 | 143 } |
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144 } |
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145 |
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146 |
43 | 147 char *th_strdup_printf(const char *fmt, ...) |
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148 { |
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149 char *res; |
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150 va_list ap; |
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151 |
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152 va_start(ap, fmt); |
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153 res = th_strdup_vprintf(fmt, ap); |
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154 va_end(ap); |
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155 |
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156 return res; |
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157 } |
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158 |
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159 |
30
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160 void th_pstr_vprintf(char **buf, const char *fmt, va_list ap) |
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161 { |
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162 char *tmp = th_strdup_vprintf(fmt, ap); |
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163 th_free(*buf); |
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164 *buf = tmp; |
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165 } |
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166 |
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167 |
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168 void th_pstr_printf(char **buf, const char *fmt, ...) |
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169 { |
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170 char *tmp; |
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171 va_list ap; |
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172 |
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173 va_start(ap, fmt); |
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174 tmp = th_strdup_vprintf(fmt, ap); |
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175 va_end(ap); |
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176 |
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177 th_free(*buf); |
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178 *buf = tmp; |
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179 } |
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180 |
88 | 181 |
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182 /* Compare two strings ignoring case [strcasecmp, strncasecmp] |
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183 */ |
186
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184 int th_strcasecmp(const char *haystack, const char *needle) |
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185 { |
186
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186 const char *s1 = haystack, *s2 = needle; |
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187 assert(haystack != NULL); |
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188 assert(needle != NULL); |
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189 |
186
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190 if (haystack == needle) |
10 | 191 return 0; |
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192 |
39 | 193 while (*s1 && *s2 && th_tolower(*s1) == th_tolower(*s2)) |
194 { | |
10 | 195 s1++; |
196 s2++; | |
197 } | |
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198 |
88 | 199 return th_tolower(*s1) - th_tolower(*s2); |
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200 } |
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201 |
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202 |
186
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203 int th_strncasecmp(const char *haystack, const char *needle, size_t n) |
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204 { |
186
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205 const char *s1 = haystack, *s2 = needle; |
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206 assert(haystack != NULL); |
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207 assert(needle != NULL); |
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208 |
186
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209 if (haystack == needle) |
10 | 210 return 0; |
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211 |
39 | 212 while (n > 0 && *s1 && *s2 && th_tolower(*s1) == th_tolower(*s2)) |
213 { | |
10 | 214 s1++; |
215 s2++; | |
216 n--; | |
217 } | |
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218 |
14
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219 return n > 0 ? (th_tolower(*s1) - th_tolower(*s2)) : 0; |
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220 } |
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221 |
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222 |
89
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223 /* Check if end of the given string str matches needle |
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224 * case-insensitively, return pointer to start of the match, |
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225 * if found, NULL otherwise. |
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226 */ |
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227 char *th_strrcasecmp(char *str, const char *needle) |
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228 { |
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229 if (str == NULL || needle == NULL) |
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230 return NULL; |
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231 |
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232 const size_t |
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233 slen = strlen(str), |
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234 nlen = strlen(needle); |
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235 |
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236 if (slen < nlen) |
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237 return NULL; |
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238 |
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239 if (th_strcasecmp(str - nlen - 1, needle) == 0) |
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240 return str - nlen - 1; |
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241 else |
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242 return NULL; |
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243 } |
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244 |
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245 |
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246 /* Remove all occurences of control characters, in-place. |
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247 * Resulting string is always shorter or same length than original. |
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248 */ |
43 | 249 void th_strip_ctrlchars(char *str) |
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250 { |
10 | 251 char *i, *j; |
252 assert(str != NULL); | |
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253 |
10 | 254 i = str; |
255 j = str; | |
39 | 256 while (*i) |
257 { | |
10 | 258 if (!th_iscntrl(*i)) |
259 *(j++) = *i; | |
260 i++; | |
261 } | |
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262 |
10 | 263 *j = 0; |
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264 } |
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265 |
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266 |
186
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267 /* Copy a given string over in *pdst. |
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268 */ |
186
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269 int th_pstrcpy(char **pdst, const char *src) |
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270 { |
186
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271 assert(pdst != NULL); |
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272 |
186
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273 if (src == NULL) |
10 | 274 return -1; |
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275 |
186
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276 th_free(*pdst); |
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277 if ((*pdst = th_malloc(strlen(src) + 1)) == NULL) |
10 | 278 return -2; |
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279 |
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280 strcpy(*pdst, src); |
10 | 281 return 0; |
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282 } |
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283 |
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284 |
186
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285 /* Concatenates a given string into string pointed by *pdst. |
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286 */ |
186
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287 int th_pstrcat(char **pdst, const char *src) |
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288 { |
186
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289 assert(pdst != NULL); |
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290 |
186
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291 if (src == NULL) |
10 | 292 return -1; |
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293 |
186
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294 if (*pdst != NULL) |
39 | 295 { |
186
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296 *pdst = th_realloc(*pdst, strlen(*pdst) + strlen(src) + 1); |
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297 if (*pdst == NULL) |
10 | 298 return -1; |
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299 |
186
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300 strcat(*pdst, src); |
39 | 301 } |
302 else | |
303 { | |
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304 *pdst = th_malloc(strlen(src) + 1); |
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305 if (*pdst == NULL) |
10 | 306 return -1; |
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307 |
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308 strcpy(*pdst, src); |
10 | 309 } |
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310 |
10 | 311 return 0; |
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312 } |
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313 |
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314 |
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315 /* Find next non-whitespace character in string. |
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316 * Updates iPos into the position of such character and |
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317 * returns pointer to the string. |
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318 */ |
43 | 319 const char *th_findnext(const char *str, size_t *pos) |
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320 { |
10 | 321 assert(str != NULL); |
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322 |
129 | 323 // Terminating NULL-character is not whitespace! |
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324 while (th_isspace(str[*pos])) |
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325 (*pos)++; |
39 | 326 |
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327 return &str[*pos]; |
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328 } |
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329 |
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330 |
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331 /* Find next sep-character from string |
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332 */ |
43 | 333 const char *th_findsep(const char *str, size_t *pos, char sep) |
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334 { |
10 | 335 assert(str != NULL); |
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336 |
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337 while (str[*pos] && str[*pos] != sep) |
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338 (*pos)++; |
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339 |
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340 return &str[*pos]; |
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341 } |
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342 |
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343 |
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344 /* Find next sep- or whitespace from string |
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345 */ |
43 | 346 const char *th_findseporspace(const char *str, size_t *pos, char sep) |
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347 { |
10 | 348 assert(str != NULL); |
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349 |
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350 while (!th_isspace(str[*pos]) && str[*pos] != sep) |
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351 (*pos)++; |
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352 |
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353 return &str[*pos]; |
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354 } |
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355 |
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356 |
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357 /* Compare a string to a pattern. Case-SENSITIVE version. |
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358 * The matching pattern can consist of any normal characters plus |
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359 * wildcards ? and *. "?" matches any character and "*" matches |
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360 * any number of characters. |
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361 */ |
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362 BOOL th_strmatch(const char *haystack, const char *pattern) |
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363 { |
175 | 364 BOOL matched = TRUE, any = FALSE, end = FALSE; |
365 const char *tmp = NULL; | |
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366 |
129 | 367 // Check given pattern and string |
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368 if (haystack == NULL || pattern == NULL) |
10 | 369 return FALSE; |
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370 |
129 | 371 // Start comparision |
10 | 372 do { |
175 | 373 matched = FALSE; |
39 | 374 switch (*pattern) |
375 { | |
10 | 376 case '?': |
129 | 377 // Any single character matches |
186
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378 if (*haystack) |
39 | 379 { |
175 | 380 matched = TRUE; |
10 | 381 pattern++; |
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382 haystack++; |
10 | 383 } |
384 break; | |
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385 |
10 | 386 case '*': |
175 | 387 matched = TRUE; |
10 | 388 pattern++; |
389 if (!*pattern) | |
175 | 390 end = TRUE; |
391 any = TRUE; | |
392 tmp = pattern; | |
10 | 393 break; |
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394 |
10 | 395 case 0: |
175 | 396 if (any) |
39 | 397 { |
186
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398 if (*haystack) |
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399 haystack++; |
10 | 400 else |
175 | 401 end = TRUE; |
39 | 402 } |
403 else | |
404 { | |
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405 if (*haystack) |
39 | 406 { |
175 | 407 if (tmp) |
39 | 408 { |
175 | 409 any = TRUE; |
410 pattern = tmp; | |
39 | 411 } |
412 else | |
175 | 413 matched = FALSE; |
44 | 414 } |
415 else | |
175 | 416 end = TRUE; |
10 | 417 } |
418 break; | |
175 | 419 |
10 | 420 default: |
175 | 421 if (any) |
39 | 422 { |
186
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423 if (*pattern == *haystack) |
39 | 424 { |
175 | 425 any = FALSE; |
426 matched = TRUE; | |
39 | 427 } |
428 else | |
429 { | |
186
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430 if (*haystack) |
39 | 431 { |
175 | 432 matched = TRUE; |
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433 haystack++; |
10 | 434 } |
435 } | |
39 | 436 } |
437 else | |
438 { | |
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439 if (*pattern == *haystack) |
39 | 440 { |
175 | 441 matched = TRUE; |
10 | 442 if (*pattern) |
443 pattern++; | |
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444 if (*haystack) |
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445 haystack++; |
39 | 446 } |
447 else | |
448 { | |
175 | 449 if (tmp) |
39 | 450 { |
175 | 451 matched = TRUE; |
452 any = TRUE; | |
453 pattern = tmp; | |
10 | 454 } |
455 } | |
456 } | |
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457 |
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458 if (!*haystack && !*pattern) |
175 | 459 end = TRUE; |
10 | 460 break; |
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461 |
129 | 462 } // switch |
175 | 463 } while (matched && !end); |
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464 |
175 | 465 return matched; |
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466 } |
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467 |
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468 |
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469 /* Compare a string to a pattern. Case-INSENSITIVE version. |
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470 */ |
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471 BOOL th_strcasematch(const char *haystack, const char *pattern) |
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472 { |
175 | 473 BOOL matched = TRUE, any = FALSE, end = FALSE; |
474 const char *tmp = NULL; | |
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475 |
129 | 476 // Check given pattern and string |
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477 if (haystack == NULL || pattern == NULL) |
10 | 478 return FALSE; |
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479 |
129 | 480 // Start comparision |
10 | 481 do { |
482 switch (*pattern) { | |
483 case '?': | |
129 | 484 // Any single character matches |
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485 if (*haystack) |
39 | 486 { |
10 | 487 pattern++; |
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488 haystack++; |
44 | 489 } |
490 else | |
175 | 491 matched = FALSE; |
10 | 492 break; |
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493 |
10 | 494 case '*': |
495 pattern++; | |
496 if (!*pattern || *pattern == '?') | |
175 | 497 end = TRUE; |
498 any = TRUE; | |
499 tmp = pattern; | |
10 | 500 break; |
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501 |
10 | 502 case 0: |
175 | 503 if (any) |
39 | 504 { |
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505 if (*haystack) |
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506 haystack++; |
10 | 507 else |
175 | 508 end = TRUE; |
39 | 509 } |
510 else | |
511 { | |
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512 if (*haystack) |
39 | 513 { |
175 | 514 if (tmp) |
39 | 515 { |
175 | 516 any = TRUE; |
517 pattern = tmp; | |
39 | 518 } |
519 else | |
175 | 520 matched = FALSE; |
44 | 521 } |
522 else | |
175 | 523 end = TRUE; |
10 | 524 } |
525 break; | |
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526 |
10 | 527 default: |
175 | 528 if (any) |
39 | 529 { |
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530 if (th_tolower(*pattern) == th_tolower(*haystack)) |
39 | 531 { |
175 | 532 any = FALSE; |
39 | 533 } |
534 else | |
535 { | |
186
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536 if (*haystack) |
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537 haystack++; |
10 | 538 else |
175 | 539 matched = FALSE; |
10 | 540 } |
39 | 541 } |
542 else | |
543 { | |
186
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544 if (th_tolower(*pattern) == th_tolower(*haystack)) |
39 | 545 { |
10 | 546 if (*pattern) |
547 pattern++; | |
186
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548 if (*haystack) |
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549 haystack++; |
39 | 550 } |
551 else | |
552 { | |
175 | 553 if (tmp) |
39 | 554 { |
175 | 555 any = TRUE; |
556 pattern = tmp; | |
39 | 557 } |
558 else | |
175 | 559 matched = FALSE; |
10 | 560 } |
561 } | |
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562 |
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563 if (!*haystack && !*pattern) |
175 | 564 end = TRUE; |
39 | 565 |
10 | 566 break; |
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567 |
129 | 568 } // switch |
175 | 569 } while (matched && !end); |
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570 |
175 | 571 return matched; |
0
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572 } |
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573 |
14
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574 |
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575 int th_get_hex_triplet(const char *str) |
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576 { |
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577 const char *p = str; |
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578 int len, val = 0; |
44 | 579 |
39 | 580 for (len = 0; *p && len < 6; p++, len++) |
581 { | |
582 if (*p >= '0' && *p <= '9') | |
583 { | |
584 val *= 16; | |
585 val += (*p - '0'); | |
586 } | |
174 | 587 else |
588 if (*p >= 'A' && *p <= 'F') | |
39 | 589 { |
590 val *= 16; | |
591 val += (*p - 'A') + 10; | |
592 } | |
174 | 593 else |
594 if (*p >= 'a' && *p <= 'f') | |
39 | 595 { |
596 val *= 16; | |
597 val += (*p - 'a') + 10; | |
598 } | |
599 else | |
14
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600 return -1; |
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601 } |
44 | 602 |
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603 return (len == 6) ? val : -1; |
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604 } |
162
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605 |
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606 |
167
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607 BOOL th_get_boolean(const char *str, BOOL *value) |
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608 { |
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609 if (!th_strcasecmp(str, "yes") || |
169
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610 !th_strcasecmp(str, "on") || |
167
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611 !th_strcasecmp(str, "true") || |
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612 !th_strcasecmp(str, "1")) |
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613 { |
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614 *value = TRUE; |
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615 return TRUE; |
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616 } |
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617 else |
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618 if (!th_strcasecmp(str, "no") || |
169
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619 !th_strcasecmp(str, "off") || |
167
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620 !th_strcasecmp(str, "false") || |
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621 !th_strcasecmp(str, "0")) |
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622 { |
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623 *value = FALSE; |
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624 return TRUE; |
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625 } |
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626 else |
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627 return FALSE; |
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628 } |
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629 |
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630 |
162
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631 static void th_pad(FILE *outFile, int count) |
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632 { |
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633 while (count--) |
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634 fputc(' ', outFile); |
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635 } |
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636 |
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637 |
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638 void th_print_wrap(FILE *fh, const char *str, int spad, int rpad, int width) |
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639 { |
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640 size_t pos = 0; |
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641 BOOL first = TRUE; |
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642 |
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643 while (str[pos]) |
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644 { |
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645 // Pre-pad line |
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646 int linelen = first ? spad : rpad; |
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647 th_pad(fh, first ? 0 : rpad); |
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648 first = FALSE; |
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649 |
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650 // Skip whitespace at line start |
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651 while (th_isspace(str[pos]) || str[pos] == '\n') pos++; |
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652 |
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653 // Handle each word |
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654 while (str[pos] && str[pos] != '\n') |
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655 { |
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656 size_t next; |
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657 int wlen; |
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658 |
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659 // Find word length and next break |
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660 for (wlen = 0, next = pos; str[next] && !th_isspace(str[next]) && str[next] != '\n'; next++, wlen++); |
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661 |
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662 // Check if we have too much of text? |
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663 if (linelen + wlen >= width) |
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664 break; |
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665 |
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666 // Print what we have |
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667 for (;pos < next; pos++, linelen++) |
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668 fputc(str[pos], fh); |
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669 |
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670 // Check if we are at end of input or hard linefeed |
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671 if (str[next] == '\n' || str[next] == 0) |
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672 break; |
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673 else |
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674 { |
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675 fputc(str[pos], fh); |
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676 pos++; |
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677 linelen++; |
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678 } |
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679 } |
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680 fprintf(fh, "\n"); |
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681 } |
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682 } |