diff options
author | Jim Meyering <jim@meyering.net> | 2000-06-21 09:09:22 +0000 |
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committer | Jim Meyering <jim@meyering.net> | 2000-06-21 09:09:22 +0000 |
commit | b865bd06192cc098bd296b11d36473d7535c22e9 (patch) | |
tree | 70cca3cb05db8023302dc3b938295c4906f66159 /lib | |
parent | 7b6e7a7341524cd2c98ae670d6eb73e19e6e169d (diff) | |
download | coreutils-b865bd06192cc098bd296b11d36473d7535c22e9.tar.xz |
New file, extracted from getline.c, with the following
changes: new parameter, delim2; both delim[12] parameters have type
`int', not `char'. The latter would lose with 8-bit delimiters.
Diffstat (limited to 'lib')
-rw-r--r-- | lib/getstr.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/lib/getstr.c b/lib/getstr.c new file mode 100644 index 000000000..66e44fe6f --- /dev/null +++ b/lib/getstr.c @@ -0,0 +1,114 @@ +/* getstr.c -- core function for GNU C library getline replacement function + + Copyright (C) 1993, 1996-2000 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + This program is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +/* Written by Jan Brittenson, bson@gnu.ai.mit.edu. */ + +#if HAVE_CONFIG_H +# include <config.h> +#endif + +#include <stdio.h> +#include <sys/types.h> + +#include <assert.h> + +#if STDC_HEADERS +# include <stdlib.h> +#else +char *malloc (), *realloc (); +#endif + +/* Always add at least this many bytes when extending the buffer. */ +#define MIN_CHUNK 64 + +/* Read up to (and including) a delimiter DELIM1 from STREAM into *LINEPTR + + OFFSET (and NUL-terminate it). If DELIM2 is non-zero, then read up + and including the first occurrence of DELIM1 or DELIM2. *LINEPTR is + a pointer returned from malloc (or NULL), pointing to *N characters of + space. It is realloc'd as necessary. Return the number of characters + read (not including the NUL terminator), or -1 on error or EOF. */ + +int +getstr (char **lineptr, size_t *n, FILE *stream, int delim1, int delim2, + size_t offset) +{ + int nchars_avail; /* Allocated but unused chars in *LINEPTR. */ + char *read_pos; /* Where we're reading into *LINEPTR. */ + int ret; + + if (!lineptr || !n || !stream) + return -1; + + if (!*lineptr) + { + *n = MIN_CHUNK; + *lineptr = malloc (*n); + if (!*lineptr) + return -1; + } + + nchars_avail = *n - offset; + read_pos = *lineptr + offset; + + for (;;) + { + register int c = getc (stream); + + /* We always want at least one char left in the buffer, since we + always (unless we get an error while reading the first char) + NUL-terminate the line buffer. */ + + assert(*n - nchars_avail == read_pos - *lineptr); + if (nchars_avail < 2) + { + if (*n > MIN_CHUNK) + *n *= 2; + else + *n += MIN_CHUNK; + + nchars_avail = *n + *lineptr - read_pos; + *lineptr = realloc (*lineptr, *n); + if (!*lineptr) + return -1; + read_pos = *n - nchars_avail + *lineptr; + assert(*n - nchars_avail == read_pos - *lineptr); + } + + if (c == EOF || ferror (stream)) + { + /* Return partial line, if any. */ + if (read_pos == *lineptr) + return -1; + else + break; + } + + *read_pos++ = c; + nchars_avail--; + + if (c == delim1 || (delim2 && c == delim2)) + /* Return the line. */ + break; + } + + /* Done - NUL terminate and return the number of chars read. */ + *read_pos = '\0'; + + ret = read_pos - (*lineptr + offset); + return ret; +} |