1 /* getndelim2 - Core of getline, getdelim, getnline, getndelim.
3 Copyright (C) 1993, 1996, 1997, 1998, 2000, 2003 Free Software
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
23 char *malloc (), *realloc ();
26 #include "unlocked-io.h"
28 /* Always add at least this many bytes when extending the buffer. */
31 /* Read up to (and including) a delimiter DELIM1 from STREAM into *LINEPTR
32 + OFFSET (and NUL-terminate it). If DELIM2 is non-zero, then read up
33 and including the first occurrence of DELIM1 or DELIM2. *LINEPTR is
34 a pointer returned from malloc (or NULL), pointing to *LINESIZE bytes of
35 space. It is realloc'd as necessary. Reallocation is limited to
36 NMAX bytes; if the line is longer than that, the extra bytes are read but
38 Return the number of bytes read and stored at *LINEPTR + OFFSET (not
39 including the NUL terminator), or -1 on error or EOF. */
42 getndelim2 (char **lineptr, size_t *linesize, size_t nmax,
43 FILE *stream, int delim1, int delim2, size_t offset)
45 size_t nbytes_avail; /* Allocated but unused chars in *LINEPTR. */
46 char *read_pos; /* Where we're reading into *LINEPTR. */
48 if (!lineptr || !linesize || !nmax || !stream)
53 size_t newlinesize = MIN_CHUNK;
55 if (newlinesize > nmax)
58 *linesize = newlinesize;
59 *lineptr = malloc (*linesize);
64 if (*linesize < offset)
67 nbytes_avail = *linesize - offset;
68 read_pos = *lineptr + offset;
70 if (nbytes_avail == 0 && *linesize >= nmax)
75 /* Here always *lineptr + *linesize == read_pos + nbytes_avail. */
77 register int c = getc (stream);
79 /* We always want at least one char left in the buffer, since we
80 always (unless we get an error while reading the first char)
81 NUL-terminate the line buffer. */
83 if (nbytes_avail < 2 && *linesize < nmax)
86 (*linesize > MIN_CHUNK ? 2 * *linesize : *linesize + MIN_CHUNK);
88 if (newlinesize > nmax)
91 if (newlinesize > *linesize)
93 *linesize = newlinesize;
94 nbytes_avail = *linesize + *lineptr - read_pos;
95 *lineptr = realloc (*lineptr, *linesize);
98 read_pos = *linesize - nbytes_avail + *lineptr;
102 if (c == EOF || ferror (stream))
104 /* Return partial line, if any. */
105 if (read_pos == *lineptr)
111 if (nbytes_avail >= 2)
117 if (c == delim1 || (delim2 && c == delim2))
118 /* Return the line. */
122 /* Done - NUL terminate and return the number of chars read.
123 At this point we know that nbytes_avail >= 1. */
126 return read_pos - (*lineptr + offset);