ab24e18c7a
* do not make backup copy by copying (just retain old file) * correctly fall back to /etc/passwd if user is not in shadow * fix bug with overlong passwd entries * be permissive on some kinds of failures * reduce stack usage * code size: -500 bytes
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) 2005, 2006 Rob Landley <rob@landley.net>
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* Copyright (C) 2004 Erik Andersen <andersen@codepoet.org>
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* Copyright (C) 2001 Matt Krai
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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/* This function reads an entire line from a text file,
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* up to a newline or NUL byte. It returns a malloc'ed char * which must be
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* stored and free'ed by the caller. If end is null '\n' isn't considered
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* end of line. If end isn't null, length of the chunk read is stored in it. */
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char *bb_get_chunk_from_file(FILE * file, int *end)
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{
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int ch;
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int idx = 0;
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char *linebuf = NULL;
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int linebufsz = 0;
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while ((ch = getc(file)) != EOF) {
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/* grow the line buffer as necessary */
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if (idx > linebufsz - 2) {
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linebuf = xrealloc(linebuf, linebufsz += 80);
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}
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linebuf[idx++] = (char) ch;
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if (!ch || (end && ch == '\n'))
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break;
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}
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if (end)
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*end = idx;
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if (linebuf) {
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// huh, is fgets discards prior data on error like this?
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// I don't think so....
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//if (ferror(file)) {
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// free(linebuf);
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// return NULL;
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//}
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linebuf = xrealloc(linebuf, idx+1);
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linebuf[idx] = 0;
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}
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return linebuf;
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}
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/* Get line, including trailing \n if any */
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char *xmalloc_fgets(FILE * file)
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{
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int i;
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return bb_get_chunk_from_file(file, &i);
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}
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/* Get line. Remove trailing \n */
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char *xmalloc_getline(FILE * file)
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{
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int i;
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char *c = bb_get_chunk_from_file(file, &i);
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if (i && c[--i] == '\n')
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c[i] = 0;
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return c;
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}
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