Mercurial > ecos-v3_0-branch
annotate packages/net/athttpd/current/src/auth.c @ 2863:7d8c61e6225c default tip
* Added execute permissions to files missed in conversion from CVS
| author | alexs |
|---|---|
| date | Thu, 26 Mar 2009 20:39:18 +0000 |
| parents | 74dbf4c3f2e1 |
| children |
| rev | line source |
|---|---|
| 2250 | 1 /* ================================================================= |
| 2 * | |
| 3 * auth.c | |
| 4 * | |
| 5 * Handles basic authentication. | |
| 6 * | |
| 7 * ================================================================= | |
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8 * ####ECOSGPLCOPYRIGHTBEGIN#### |
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9 * ------------------------------------------- |
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10 * This file is part of eCos, the Embedded Configurable Operating System. |
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11 * Copyright (C) 2005 Free Software Foundation, Inc. |
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12 * |
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13 * eCos is free software; you can redistribute it and/or modify it under |
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14 * the terms of the GNU General Public License as published by the Free |
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15 * Software Foundation; either version 2 or (at your option) any later |
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16 * version. |
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17 * |
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18 * eCos is distributed in the hope that it will be useful, but WITHOUT |
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19 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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20 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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21 * for more details. |
| 2250 | 22 * |
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23 * You should have received a copy of the GNU General Public License |
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24 * along with eCos; if not, write to the Free Software Foundation, Inc., |
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25 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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26 * |
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27 * As a special exception, if other files instantiate templates or use |
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28 * macros or inline functions from this file, or you compile this file |
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29 * and link it with other works to produce a work based on this file, |
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30 * this file does not by itself cause the resulting work to be covered by |
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31 * the GNU General Public License. However the source code for this file |
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32 * must still be made available in accordance with section (3) of the GNU |
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33 * General Public License v2. |
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34 * |
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35 * This exception does not invalidate any other reasons why a work based |
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36 * on this file might be covered by the GNU General Public License. |
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37 * ------------------------------------------- |
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38 * ####ECOSGPLCOPYRIGHTEND#### |
| 2250 | 39 * ================================================================= |
| 40 * #####DESCRIPTIONBEGIN#### | |
| 41 * | |
| 42 * Author(s): Anthony Tonizzo (atonizzo@gmail.com) | |
| 43 * Contributors: | |
| 44 * Date: 2006-06-12 | |
| 45 * Purpose: | |
| 46 * Description: | |
| 47 * | |
| 48 * ####DESCRIPTIONEND#### | |
| 49 * | |
| 50 * ================================================================= | |
| 51 */ | |
| 52 #include <pkgconf/hal.h> | |
| 53 #include <pkgconf/kernel.h> | |
| 54 #include <cyg/kernel/kapi.h> // Kernel API. | |
| 55 #include <cyg/hal/hal_tables.h> | |
| 56 | |
| 57 #include <stdio.h> | |
| 58 | |
| 59 #include <network.h> | |
| 60 #include <string.h> | |
| 61 | |
| 62 #include <cyg/athttpd/http.h> | |
| 63 #include <cyg/athttpd/md5.h> | |
| 64 | |
| 2265 | 65 // This is a string that contains the domain that is currently authorized. |
| 2250 | 66 cyg_uint8 *cyg_httpd_current_authName; |
| 67 | |
| 68 CYG_HAL_TABLE_BEGIN(cyg_httpd_auth_table, httpd_auth_table ); | |
| 69 CYG_HAL_TABLE_END(cyg_httpd_auth_table_end, httpd_auth_table ); | |
| 70 | |
| 71 __externC cyg_httpd_auth_table_entry cyg_httpd_auth_table[]; | |
| 72 __externC cyg_httpd_auth_table_entry cyg_httpd_auth_table_end[]; | |
| 73 | |
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74 // Variables used for authorization. The header parsing code will only copy |
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75 // up to AUTH_STORAGE_BUFFER_LENGTH bytes into cyg_httpd_md5_response to |
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76 // avoid overflow. |
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77 char cyg_httpd_md5_response[AUTH_STORAGE_BUFFER_LENGTH + 1]; |
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78 char cyg_httpd_md5_digest[AUTH_STORAGE_BUFFER_LENGTH + 1]; |
| 2250 | 79 char cyg_httpd_md5_nonce[33]; |
| 80 char cyg_httpd_md5_cnonce[33]; | |
| 81 char cyg_httpd_md5_noncecount[9]; | |
| 82 char cyg_httpd_md5_ha2[HASHHEXLEN+1] = {'\0'}; | |
| 83 char cyg_httpd_md5_ha1[HASHHEXLEN+1]; | |
| 84 | |
| 85 char b64string[] = | |
| 2265 | 86 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
| 2250 | 87 |
| 88 cyg_httpd_auth_table_entry* | |
| 89 cyg_httpd_auth_entry_from_path(char *authPath) | |
| 90 { | |
| 91 cyg_httpd_auth_table_entry *entry = cyg_httpd_auth_table; | |
| 92 if (strcmp(authPath, "/") != 0) | |
| 93 while (entry != cyg_httpd_auth_table_end) | |
| 94 { | |
| 95 if (strncmp(entry->auth_dirname, | |
| 96 authPath, | |
| 97 strlen(entry->auth_dirname)) == 0) | |
| 98 return entry; | |
| 99 entry++; | |
| 100 } | |
| 101 else | |
| 102 while (entry != cyg_httpd_auth_table_end) | |
| 103 { | |
| 104 if (strcmp(entry->auth_dirname, authPath) == 0) | |
| 105 return entry; | |
| 106 entry++; | |
| 107 } | |
| 108 | |
| 109 return (cyg_httpd_auth_table_entry *)0; | |
| 110 } | |
| 111 | |
| 112 cyg_httpd_auth_table_entry* | |
| 113 cyg_httpd_auth_entry_from_domain(char *authDomain) | |
| 114 { | |
| 115 cyg_httpd_auth_table_entry *entry = cyg_httpd_auth_table; | |
| 116 while (entry != cyg_httpd_auth_table_end) | |
| 117 { | |
| 118 if (!strncmp((const char*)authDomain, | |
| 119 entry->auth_domainname, | |
| 120 strlen(entry->auth_domainname))) | |
| 121 return entry; | |
| 122 entry++; | |
| 123 } | |
| 124 | |
| 125 return (cyg_httpd_auth_table_entry *)0; | |
| 126 } | |
| 127 | |
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128 static cyg_int32 |
| 2250 | 129 cyg_httpd_base64_decode(char* to, char* from, cyg_uint32 len ) |
| 130 { | |
| 131 char *fromp = from; | |
| 132 char *top = to; | |
| 133 char *p; | |
| 134 char cbyte; | |
| 135 char obyte; | |
| 136 cyg_int32 padding = 0; | |
| 137 | |
| 2265 | 138 for (; len >= 4; len -= 4) |
| 2250 | 139 { |
| 140 if ((cbyte = *fromp++) == '=') | |
| 141 cbyte = 0; | |
| 2265 | 142 else |
| 2250 | 143 { |
| 144 if (badchar(cbyte, p ) ) | |
| 145 return -1; | |
| 146 cbyte = (p - b64string); | |
| 147 } | |
| 148 obyte = cbyte << 2; | |
| 149 | |
| 150 if ((cbyte = *fromp++) == '=') | |
| 151 cbyte = 0; | |
| 2265 | 152 else |
| 2250 | 153 { |
| 2265 | 154 if (badchar(cbyte, p)) |
| 2250 | 155 return -1; |
| 156 cbyte = p - b64string; | |
| 2265 | 157 } |
| 2250 | 158 obyte |= cbyte >> 4; |
| 159 *top++ = obyte; | |
| 160 | |
| 161 obyte = cbyte << 4; | |
| 162 if ((cbyte = *fromp++) == '=') | |
| 163 { | |
| 164 cbyte = 0; | |
| 165 padding++; | |
| 166 } | |
| 2265 | 167 else |
| 2250 | 168 { |
| 169 padding = 0; | |
| 170 if (badchar(cbyte, p)) | |
| 171 return -1; | |
| 172 cbyte = p - b64string; | |
| 173 } | |
| 174 obyte |= cbyte >> 2; | |
| 175 *top++ = obyte; | |
| 176 | |
| 177 obyte = cbyte << 6; | |
| 178 if ((cbyte = *fromp++) == '=') | |
| 179 { | |
| 180 cbyte = 0; | |
| 181 padding++; | |
| 182 } | |
| 183 else | |
| 184 { | |
| 185 padding = 0; | |
| 186 if (badchar(cbyte, p)) | |
| 187 return -1; | |
| 188 cbyte = p - b64string; | |
| 189 } | |
| 190 obyte |= cbyte; | |
| 191 *top++ = obyte; | |
| 192 } | |
| 193 | |
| 194 *top = 0; | |
| 195 if (len) | |
| 196 return -1; | |
| 197 return (top - to) - padding; | |
| 198 } | |
| 199 | |
| 200 // The following code is a slightly modified version of those available at the | |
| 201 // end of RFC1270. | |
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202 static void cyg_httpd_cvthex(HASH Bin, HASHHEX Hex) |
| 2250 | 203 { |
| 204 unsigned short i; | |
| 205 unsigned char j; | |
| 206 | |
| 207 for (i = 0; i < HASHLEN; i++) | |
| 208 { | |
| 209 j = (Bin[i] >> 4) & 0xf; | |
| 210 if (j <= 9) | |
| 211 Hex[i*2] = (j + '0'); | |
| 212 else | |
| 213 Hex[i*2] = (j + 'a' - 10); | |
| 214 j = Bin[i] & 0xf; | |
| 215 if (j <= 9) | |
| 216 Hex[i*2+1] = (j + '0'); | |
| 217 else | |
| 218 Hex[i*2+1] = (j + 'a' - 10); | |
| 219 }; | |
| 220 Hex[HASHHEXLEN] = '\0'; | |
| 221 }; | |
| 222 | |
| 223 // Calculate H(A1) as per spec. | |
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224 static void |
| 2250 | 225 cyg_httpd_digest_calc_HA1( char *pszAlg, |
| 226 char *pszUserName, | |
| 227 char *pszRealm, | |
| 228 char *pszPassword, | |
| 229 char *pszNonce, | |
| 230 char *pszCNonce, | |
| 231 HASHHEX SessionKey ) | |
| 232 { | |
| 233 MD5_CTX Md5Ctx; | |
| 234 HASH HA1; | |
| 235 | |
| 236 MD5Init(&Md5Ctx); | |
| 237 MD5Update(&Md5Ctx, (unsigned char*)pszUserName, strlen(pszUserName)); | |
| 238 MD5Update(&Md5Ctx, (unsigned char*)":", 1); | |
| 239 MD5Update(&Md5Ctx, (unsigned char*)pszRealm, strlen(pszRealm)); | |
| 240 MD5Update(&Md5Ctx, (unsigned char*)":", 1); | |
| 241 MD5Update(&Md5Ctx, (unsigned char*)pszPassword, strlen(pszPassword)); | |
| 242 MD5Final((unsigned char*)HA1, &Md5Ctx); | |
| 243 if (strcmp(pszAlg, "md5-sess") == 0) | |
| 244 { | |
| 245 MD5Init(&Md5Ctx); | |
| 246 MD5Update(&Md5Ctx, (unsigned char*)HA1, HASHLEN); | |
| 247 MD5Update(&Md5Ctx, (unsigned char*)":", 1); | |
| 248 MD5Update(&Md5Ctx, (unsigned char*)pszNonce, strlen(pszNonce)); | |
| 249 MD5Update(&Md5Ctx, (unsigned char*)":", 1); | |
| 250 MD5Update(&Md5Ctx, (unsigned char*)pszCNonce, strlen(pszCNonce)); | |
| 251 MD5Final((unsigned char*)HA1, &Md5Ctx); | |
| 252 }; | |
| 253 cyg_httpd_cvthex(HA1, SessionKey); | |
| 254 }; | |
| 255 | |
| 256 // Calculate request-digest/response-digest as per HTTP Digest spec. | |
| 257 void | |
| 258 cyg_httpd_digest_calc_response(HASHHEX HA1, | |
| 259 char *pszNonce, | |
| 260 char *pszNonceCount, | |
| 261 char *pszCNonce, | |
| 262 char *pszQop, | |
| 263 char *pszMethod, | |
| 264 char *pszDigestUri, | |
| 265 HASHHEX HEntity, | |
| 266 HASHHEX Response) | |
| 267 { | |
| 268 MD5_CTX Md5Ctx; | |
| 269 HASH HA2; | |
| 270 HASH RespHash; | |
| 271 HASHHEX HA2Hex; | |
| 272 | |
| 273 // Calculate H(A2). | |
| 274 MD5Init(&Md5Ctx); | |
| 275 MD5Update(&Md5Ctx, (unsigned char*)pszMethod, strlen(pszMethod)); | |
| 276 MD5Update(&Md5Ctx, (unsigned char*)":", 1); | |
| 277 MD5Update(&Md5Ctx, (unsigned char*)pszDigestUri, strlen(pszDigestUri)); | |
| 278 if (strcmp(pszQop, "auth-int") == 0) { | |
| 279 MD5Update(&Md5Ctx, (unsigned char*)":", 1); | |
| 280 MD5Update(&Md5Ctx, (unsigned char*)HEntity, HASHHEXLEN); | |
| 281 }; | |
| 282 MD5Final((unsigned char*)HA2, &Md5Ctx); | |
| 283 cyg_httpd_cvthex(HA2, HA2Hex); | |
| 284 | |
| 285 // calculate response | |
| 286 MD5Init(&Md5Ctx); | |
| 287 MD5Update(&Md5Ctx, (unsigned char*)HA1, HASHHEXLEN); | |
| 288 MD5Update(&Md5Ctx, (unsigned char*)":", 1); | |
| 289 MD5Update(&Md5Ctx, (unsigned char*)pszNonce, strlen(pszNonce)); | |
| 290 MD5Update(&Md5Ctx, (unsigned char*)":", 1); | |
| 291 if (*pszQop) | |
| 292 { | |
| 293 MD5Update(&Md5Ctx, (unsigned char*)pszNonceCount, strlen(pszNonceCount)); | |
| 294 MD5Update(&Md5Ctx, (unsigned char*)":", 1); | |
| 295 MD5Update(&Md5Ctx, (unsigned char*)pszCNonce, strlen(pszCNonce)); | |
| 296 MD5Update(&Md5Ctx, (unsigned char*)":", 1); | |
| 297 MD5Update(&Md5Ctx, (unsigned char*)pszQop, strlen(pszQop)); | |
| 298 MD5Update(&Md5Ctx, (unsigned char*)":", 1); | |
| 299 }; | |
| 300 MD5Update(&Md5Ctx, (unsigned char*)HA2Hex, HASHHEXLEN); | |
| 301 MD5Final((unsigned char*)RespHash, &Md5Ctx); | |
| 302 cyg_httpd_cvthex(RespHash, Response); | |
| 303 }; | |
| 304 | |
| 305 cyg_httpd_auth_table_entry* | |
| 306 cyg_httpd_is_authenticated(char* fname) | |
| 307 { | |
| 308 // Let's check if the directory access needs authorization. The | |
| 309 // authentication is done on the directory name. | |
| 310 cyg_httpd_auth_table_entry* entry = | |
| 311 cyg_httpd_auth_entry_from_path(fname); | |
| 312 if (entry != 0) | |
| 313 { | |
| 314 if (entry->auth_mode == CYG_HTTPD_AUTH_BASIC) | |
| 315 { | |
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316 cyg_httpd_base64_decode(cyg_httpd_md5_digest, |
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317 cyg_httpd_md5_response, |
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318 strlen(cyg_httpd_md5_response)); |
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319 char *colon = rindex(cyg_httpd_md5_digest, ':'); |
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320 if (colon == NULL) |
| 2250 | 321 { |
| 322 return (httpstate.needs_auth = entry); | |
| 323 } | |
| 324 else | |
| 325 { | |
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326 *colon = '\0'; // Crypto now has the username. |
| 2250 | 327 |
| 328 // In the case of a 'Basic" authentication, the HTTP header | |
| 329 // did not return to us the domain name that we sent when we | |
| 330 // challenged the request: The only things that are returned | |
| 331 // are the username:password duo. In this case I will just | |
| 332 // compare the entry's username/password to those read from | |
| 333 // the header. | |
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334 if ((strcmp(entry->auth_username,cyg_httpd_md5_digest) != 0) || |
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335 (strcmp(entry->auth_password, ++colon) != 0)) |
| 2250 | 336 return (httpstate.needs_auth = entry); |
| 337 } | |
| 338 } | |
| 339 else | |
| 340 { | |
| 341 char *cyg_httpd_md5_method; | |
| 342 | |
| 343 switch (httpstate.method) | |
| 344 { | |
| 345 case CYG_HTTPD_METHOD_GET: | |
| 346 cyg_httpd_md5_method = "GET"; | |
| 347 break; | |
| 348 case CYG_HTTPD_METHOD_POST: | |
| 349 cyg_httpd_md5_method = "POST"; | |
| 350 break; | |
| 351 default: | |
| 352 cyg_httpd_md5_method = "HEAD"; | |
| 353 break; | |
| 354 } | |
| 355 cyg_httpd_digest_calc_HA1(CYG_HTTPD_MD5_AUTH_NAME, | |
| 356 entry->auth_username, | |
| 357 entry->auth_domainname, | |
| 358 entry->auth_password, | |
| 359 cyg_httpd_md5_nonce, | |
| 360 cyg_httpd_md5_cnonce, | |
| 361 cyg_httpd_md5_ha1); | |
| 362 cyg_httpd_digest_calc_response(cyg_httpd_md5_ha1, | |
| 363 cyg_httpd_md5_nonce, | |
| 364 cyg_httpd_md5_noncecount, | |
| 365 cyg_httpd_md5_cnonce, | |
| 366 CYG_HTTPD_MD5_AUTH_QOP, | |
| 367 cyg_httpd_md5_method, | |
| 368 httpstate.url, | |
| 369 cyg_httpd_md5_ha2, | |
| 370 cyg_httpd_md5_digest); | |
| 371 if (strcmp(cyg_httpd_md5_response, cyg_httpd_md5_digest) != 0) | |
| 372 return (httpstate.needs_auth = entry); | |
| 373 } | |
| 374 } | |
| 375 // No need for authentication... | |
| 376 return (cyg_httpd_auth_table_entry*)0; | |
| 377 } | |
| 378 | |
| 379 char* | |
| 380 cyg_httpd_digest_data(char *dest, char *src) | |
| 381 { | |
| 382 int exit = 0; | |
| 383 while (exit == 0) | |
| 384 { | |
| 385 switch (*src ) | |
| 386 { | |
| 387 case '\r': | |
| 388 case '\n': | |
| 389 *dest = '\0'; | |
| 390 exit = 1; | |
| 391 break; | |
|
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392 case ',': |
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393 // If it is a comma there might or might not be a blank space |
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394 // following it (IE7 inserts no spaces, everyone else does...) |
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395 // so before exiting the loop remove any blank space that follows. |
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396 if (src[1] == ' ') |
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397 src++; |
| 2250 | 398 case ' ': |
| 399 src++; | |
| 400 *dest = '\0'; | |
| 401 exit = 1; | |
| 402 break; | |
| 403 case '"': | |
| 404 src++; | |
| 405 break; | |
| 406 default: | |
| 407 *dest++ = *src++; | |
| 408 } | |
| 409 } | |
| 410 return src; | |
| 411 } | |
| 412 | |
| 413 // Skips through fields we do not need. | |
| 414 char* | |
| 415 cyg_httpd_digest_skip(char *p) | |
| 416 { | |
| 417 if (*p == '"') | |
| 418 { | |
| 419 p++; | |
| 420 while ((*p != '"') && (*p != '\n')) | |
| 421 p++; | |
| 422 p++; | |
| 423 if (*p == ',') | |
| 424 p++; | |
| 425 if (*p == ' ') | |
| 426 p++; | |
| 427 if (*p == '\n') | |
| 428 p++; | |
| 429 } | |
| 430 else | |
| 431 { | |
| 432 while ((*p != ' ') && (*p != '\n')) | |
| 433 p++; | |
| 434 if (*p == ',') | |
| 435 p++; | |
| 436 if (*p == ' ') | |
| 437 p++; | |
| 438 if (*p == '\n') | |
| 439 p++; | |
| 440 } | |
| 441 return p; | |
| 442 } |