134 lines
2.8 KiB
C
134 lines
2.8 KiB
C
/* Copyright 2002, Red Hat Inc. - all rights reserved */
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/*
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FUNCTION
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<<getdelim>>---read a line up to a specified line delimiter
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INDEX
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getdelim
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SYNOPSIS
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#include <stdio.h>
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int getdelim(char **<[bufptr]>, size_t *<[n]>,
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int <[delim]>, FILE *<[fp]>);
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DESCRIPTION
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<<getdelim>> reads a file <[fp]> up to and possibly including a specified
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delimiter <[delim]>. The line is read into a buffer pointed to
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by <[bufptr]> and designated with size *<[n]>. If the buffer is
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not large enough, it will be dynamically grown by <<getdelim>>.
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As the buffer is grown, the pointer to the size <[n]> will be
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updated.
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RETURNS
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<<getdelim>> returns <<-1>> if no characters were successfully read;
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otherwise, it returns the number of bytes successfully read.
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At end of file, the result is nonzero.
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PORTABILITY
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<<getdelim>> is a glibc extension.
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No supporting OS subroutines are directly required.
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*/
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#include <_ansi.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "local.h"
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#define MIN_LINE_SIZE 4
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#define DEFAULT_LINE_SIZE 128
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ssize_t
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__getdelim (char **bufptr,
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size_t *n,
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int delim,
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FILE *fp)
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{
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char *buf;
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char *ptr;
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size_t newsize, numbytes;
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int pos;
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int ch;
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int cont;
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if (fp == NULL || bufptr == NULL || n == NULL)
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{
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errno = EINVAL;
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return -1;
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}
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buf = *bufptr;
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if (buf == NULL || *n < MIN_LINE_SIZE)
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{
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buf = (char *)realloc (*bufptr, DEFAULT_LINE_SIZE);
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if (buf == NULL)
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{
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return -1;
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}
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*bufptr = buf;
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*n = DEFAULT_LINE_SIZE;
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}
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CHECK_INIT (_REENT, fp);
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_newlib_flockfile_start (fp);
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numbytes = *n;
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ptr = buf;
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cont = 1;
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while (cont)
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{
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/* fill buffer - leaving room for nul-terminator */
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while (--numbytes > 0)
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{
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if ((ch = getc_unlocked (fp)) == EOF)
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{
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cont = 0;
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break;
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}
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else
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{
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*ptr++ = ch;
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if (ch == delim)
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{
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cont = 0;
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break;
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}
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}
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}
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if (cont)
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{
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/* Buffer is too small so reallocate a larger buffer. */
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pos = ptr - buf;
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newsize = (*n << 1);
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buf = realloc (buf, newsize);
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if (buf == NULL)
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{
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cont = 0;
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break;
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}
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/* After reallocating, continue in new buffer */
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*bufptr = buf;
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*n = newsize;
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ptr = buf + pos;
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numbytes = newsize - pos;
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}
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}
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_newlib_flockfile_end (fp);
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/* if no input data, return failure */
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if (ptr == buf)
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return -1;
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/* otherwise, nul-terminate and return number of bytes read */
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*ptr = '\0';
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return (ssize_t)(ptr - buf);
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}
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