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This change retains "or later" state! No licensing _changes_ here, only form is adjusted (article, space between "GPL" and "v2" and so on). Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
203 lines
4.7 KiB
C
203 lines
4.7 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 source tree.
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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, up to a newline
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* or NUL byte, inclusive. It returns a malloc'ed char * which
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* must be 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 is stored in it.
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* If lineno is not NULL, *lineno is incremented for each line,
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* and also trailing '\' is recognized as line continuation.
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*
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* Returns NULL if EOF/error. */
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char* FAST_FUNC bb_get_chunk_with_continuation(FILE *file, int *end, int *lineno)
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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) {
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linebufsz += 256;
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linebuf = xrealloc(linebuf, linebufsz);
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}
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linebuf[idx++] = (char) ch;
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if (!ch)
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break;
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if (end && ch == '\n') {
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if (lineno == NULL)
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break;
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(*lineno)++;
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if (idx < 2 || linebuf[idx-2] != '\\')
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break;
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idx -= 2;
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}
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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, does fgets discard 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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char* FAST_FUNC bb_get_chunk_from_file(FILE *file, int *end)
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{
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return bb_get_chunk_with_continuation(file, end, NULL);
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}
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/* Get line, including trailing \n if any */
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char* FAST_FUNC 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* FAST_FUNC xmalloc_fgetline(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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#if 0
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/* GNUism getline() should be faster (not tested) than a loop with fgetc */
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/* Get line, including trailing \n if any */
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char* FAST_FUNC xmalloc_fgets(FILE *file)
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{
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char *res_buf = NULL;
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size_t res_sz;
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if (getline(&res_buf, &res_sz, file) == -1) {
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free(res_buf); /* uclibc allocates a buffer even on EOF. WTF? */
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res_buf = NULL;
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}
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//TODO: trimming to res_sz?
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return res_buf;
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}
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/* Get line. Remove trailing \n */
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char* FAST_FUNC xmalloc_fgetline(FILE *file)
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{
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char *res_buf = NULL;
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size_t res_sz;
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res_sz = getline(&res_buf, &res_sz, file);
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if ((ssize_t)res_sz != -1) {
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if (res_buf[res_sz - 1] == '\n')
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res_buf[--res_sz] = '\0';
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//TODO: trimming to res_sz?
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} else {
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free(res_buf); /* uclibc allocates a buffer even on EOF. WTF? */
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res_buf = NULL;
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}
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return res_buf;
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}
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#endif
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#if 0
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/* Faster routines (~twice as fast). +170 bytes. Unused as of 2008-07.
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*
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* NB: they stop at NUL byte too.
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* Performance is important here. Think "grep 50gigabyte_file"...
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* Ironically, grep can't use it because of NUL issue.
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* We sorely need C lib to provide fgets which reports size!
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*
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* Update:
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* Actually, uclibc and glibc have it. man getline. It's GNUism,
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* but very useful one (if it's as fast as this code).
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* TODO:
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* - currently, sed and sort use bb_get_chunk_from_file and heavily
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* depend on its "stop on \n or \0" behavior, and STILL they fail
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* to handle all cases with embedded NULs correctly. So:
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* - audit sed and sort; convert them to getline FIRST.
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* - THEN ditch bb_get_chunk_from_file, replace it with getline.
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* - provide getline implementation for non-GNU systems.
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*/
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static char* xmalloc_fgets_internal(FILE *file, int *sizep)
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{
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int len;
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int idx = 0;
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char *linebuf = NULL;
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while (1) {
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char *r;
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linebuf = xrealloc(linebuf, idx + 0x100);
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r = fgets(&linebuf[idx], 0x100, file);
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if (!r) {
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/* need to terminate in case this is error
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* (EOF puts NUL itself) */
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linebuf[idx] = '\0';
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break;
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}
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/* stupid. fgets knows the len, it should report it somehow */
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len = strlen(&linebuf[idx]);
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idx += len;
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if (len != 0xff || linebuf[idx - 1] == '\n')
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break;
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}
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*sizep = idx;
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if (idx) {
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/* xrealloc(linebuf, idx + 1) is up to caller */
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return linebuf;
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}
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free(linebuf);
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return NULL;
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}
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/* Get line, remove trailing \n */
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char* FAST_FUNC xmalloc_fgetline_fast(FILE *file)
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{
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int sz;
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char *r = xmalloc_fgets_internal(file, &sz);
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if (r && r[sz - 1] == '\n')
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r[--sz] = '\0';
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return r; /* not xrealloc(r, sz + 1)! */
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}
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char* FAST_FUNC xmalloc_fgets(FILE *file)
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{
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int sz;
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return xmalloc_fgets_internal(file, &sz);
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}
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/* Get line, remove trailing \n */
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char* FAST_FUNC xmalloc_fgetline(FILE *file)
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{
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int sz;
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char *r = xmalloc_fgets_internal(file, &sz);
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if (!r)
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return r;
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if (r[sz - 1] == '\n')
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r[--sz] = '\0';
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return xrealloc(r, sz + 1);
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}
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#endif
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