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author | Ulrich Drepper <drepper@cygnus.com> | 2000-06-16 07:49:23 +0000 |
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committer | Ulrich Drepper <drepper@cygnus.com> | 2000-06-16 07:49:23 +0000 |
commit | 60d2084de5dc3b65e6657f695f0f26df24b0f565 (patch) | |
tree | 224f21c30351570d6d7f06a385e829d5ab320f67 /lib/getline.c | |
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Initial revision
Diffstat (limited to 'lib/getline.c')
-rw-r--r-- | lib/getline.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/lib/getline.c b/lib/getline.c new file mode 100644 index 0000000..ba05abb --- /dev/null +++ b/lib/getline.c @@ -0,0 +1,155 @@ +/* getline.c -- Replacement for GNU C library function getline + +Copyright (C) 1993, 1996 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 + +/* The `getdelim' function is only declared if the following symbol + is defined. */ +#define _GNU_SOURCE 1 +#include <stdio.h> +#include <sys/types.h> + +#if defined __GNU_LIBRARY__ && HAVE_GETDELIM + +int +getline (lineptr, n, stream) + char **lineptr; + size_t *n; + FILE *stream; +{ + return getdelim (lineptr, n, '\n', stream); +} + + +#else /* ! have getdelim */ + +# define NDEBUG +# 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 TERMINATOR from STREAM into *LINEPTR + + OFFSET (and null-terminate it). *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 + null terminator), or -1 on error or EOF. */ + +int +getstr (lineptr, n, stream, terminator, offset) + char **lineptr; + size_t *n; + FILE *stream; + char terminator; + 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 == terminator) + /* Return the line. */ + break; + } + + /* Done - NUL terminate and return the number of chars read. */ + *read_pos = '\0'; + + ret = read_pos - (*lineptr + offset); + return ret; +} + +int +getline (lineptr, n, stream) + char **lineptr; + size_t *n; + FILE *stream; +{ + return getstr (lineptr, n, stream, '\n', 0); +} + +int +getdelim (lineptr, n, delimiter, stream) + char **lineptr; + size_t *n; + int delimiter; + FILE *stream; +{ + return getstr (lineptr, n, stream, delimiter, 0); +} +#endif |