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Diffstat (limited to 'contrib/gperf/lib/getline.cc')
-rw-r--r-- | contrib/gperf/lib/getline.cc | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/contrib/gperf/lib/getline.cc b/contrib/gperf/lib/getline.cc new file mode 100644 index 0000000..d3393fb --- /dev/null +++ b/contrib/gperf/lib/getline.cc @@ -0,0 +1,119 @@ +/* getline.c -- Replacement for GNU C library function getline + +Copyright (C) 1993, 1996, 2001-2002 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, +USA. */ + +/* Written by Jan Brittenson, bson@gnu.ai.mit.edu. */ + +/* Specification. */ +#include "getline.h" + +#include <stddef.h> +#include <stdio.h> +#include <string.h> +#include <assert.h> + +/* Always add at least this many bytes when extending the buffer. */ +#define MIN_CHUNK 64 + +/* Reads up to (and including) a TERMINATOR from STREAM into *LINEPTR + OFFSET + (and null-terminate it). *LINEPTR is a pointer returned from new [] (or + NULL), pointing to *N characters of space. It is realloc'd as + necessary. Returns the number of characters read (not including the + null terminator), or -1 on error or immediate EOF. + NOTE: There is another getstr() function declared in <curses.h>. */ + +static int +getstr (char **lineptr, size_t *n, FILE *stream, char terminator, size_t offset) +{ + size_t nchars_avail; /* Allocated but unused chars in *LINEPTR. */ + char *read_pos; /* Where we're reading into *LINEPTR. */ + + if (!lineptr || !n || !stream) + return -1; + + if (!*lineptr) + { + *n = MIN_CHUNK; + *lineptr = new char[*n]; + } + + 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 == (size_t) (read_pos - *lineptr)); + if (nchars_avail < 2) + { + if (*n > MIN_CHUNK) + *n *= 2; + else + *n += MIN_CHUNK; + + nchars_avail = *n + *lineptr - read_pos; + char *new_line = new char[*n]; + if (*lineptr) + { + memcpy (new_line, *lineptr, read_pos - *lineptr); + delete[] *lineptr; + } + *lineptr = new_line; + read_pos = *n - nchars_avail + *lineptr; + assert (*n - nchars_avail == (size_t) (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'; + + return read_pos - (*lineptr + offset); +} + +int +get_line (char **lineptr, size_t *n, FILE *stream) +{ + return getstr (lineptr, n, stream, '\n', 0); +} + +int +get_delim (char **lineptr, size_t *n, int delimiter, FILE *stream) +{ + return getstr (lineptr, n, stream, delimiter, 0); +} |