1 /* Copyright (C) 1994, 1996, 1997, 1998, 2001 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, write to the Free 16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17 02111-1307 USA. 18 19 As a special exception, if you link the code in this file with 20 files compiled with a GNU compiler to produce an executable, 21 that does not cause the resulting executable to be covered by 22 the GNU Lesser General Public License. This exception does not 23 however invalidate any other reasons why the executable file 24 might be covered by the GNU Lesser General Public License. 25 This exception applies to code released by its copyright holders 26 in files containing the exception. 27 */ 28 29 #include "libioP.h" 30 #include <stdlib.h> 31 #include <string.h> 32 #include <errno.h> 33 34 /* Read up to (and including) a TERMINATOR from FP into *LINEPTR 35 (and null-terminate it). *LINEPTR is a pointer returned from malloc (or 36 NULL), pointing to *N characters of space. It is realloc'ed as 37 necessary. Returns the number of characters read (not including the 38 null terminator), or -1 on error or EOF. */ 39 40 _IO_ssize_t 41 _IO_getdelim(char **lineptr, _IO_size_t *n, int delimiter, _IO_FILE *fp) 42 { 43 int result; 44 _IO_ssize_t cur_len = 0; 45 _IO_ssize_t len; 46 47 if (lineptr == NULL || n == NULL) 48 { 49 MAYBE_SET_EINVAL; 50 return -1; 51 } 52 CHECK_FILE (fp, -1); 53 _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp); 54 _IO_flockfile (fp); 55 if (_IO_ferror_unlocked (fp)) 56 { 57 result = -1; 58 goto unlock_return; 59 } 60 61 if (*lineptr == NULL || *n == 0) 62 { 63 *n = 120; 64 *lineptr = (char *) malloc (*n); 65 if (*lineptr == NULL) 66 { 67 result = -1; 68 goto unlock_return; 69 } 70 } 71 72 len = fp->_IO_read_end - fp->_IO_read_ptr; 73 if (len <= 0) 74 { 75 if (__underflow (fp) == EOF) 76 { 77 result = -1; 78 goto unlock_return; 79 } 80 len = fp->_IO_read_end - fp->_IO_read_ptr; 81 } 82 83 for (;;) 84 { 85 _IO_size_t needed; 86 char *t; 87 t = (char *) memchr ((void *) fp->_IO_read_ptr, delimiter, len); 88 if (t != NULL) 89 len = (t - fp->_IO_read_ptr) + 1; 90 /* Make enough space for len+1 (for final NUL) bytes. */ 91 needed = cur_len + len + 1; 92 if (needed > *n) 93 { 94 char *new_lineptr; 95 96 if (needed < 2 * *n) 97 needed = 2 * *n; /* Be generous. */ 98 new_lineptr = (char *) realloc (*lineptr, needed); 99 if (new_lineptr == NULL) 100 { 101 result = -1; 102 goto unlock_return; 103 } 104 *lineptr = new_lineptr; 105 *n = needed; 106 } 107 memcpy (*lineptr + cur_len, (void *) fp->_IO_read_ptr, len); 108 fp->_IO_read_ptr += len; 109 cur_len += len; 110 if (t != NULL || __underflow (fp) == EOF) 111 break; 112 len = fp->_IO_read_end - fp->_IO_read_ptr; 113 } 114 (*lineptr)[cur_len] = '\0'; 115 result = cur_len; 116 117 unlock_return: 118 _IO_funlockfile (fp); 119 _IO_cleanup_region_end (0); 120 return result; 121 } 122 123 #ifdef weak_alias 124 weak_alias (_IO_getdelim, __getdelim) 125 weak_alias (_IO_getdelim, getdelim) 126 #endif 127