1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) 2005, 2006 Rob Landley <rob@landley.net>
6 * Copyright (C) 2004 Erik Andersen <andersen@codepoet.org>
7 * Copyright (C) 2001 Matt Krai
9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
14 /* This function reads an entire line from a text file, up to a newline
15 * or NUL byte, inclusive. It returns a malloc'ed char * which
16 * must be free'ed by the caller. If end is NULL '\n' isn't considered
17 * end of line. If end isn't NULL, length of the chunk read is stored in it.
18 * Return NULL if EOF/error */
19 char* FAST_FUNC bb_get_chunk_from_file(FILE *file, int *end)
26 while ((ch = getc(file)) != EOF) {
27 /* grow the line buffer as necessary */
28 if (idx >= linebufsz) {
30 linebuf = xrealloc(linebuf, linebufsz);
32 linebuf[idx++] = (char) ch;
33 if (!ch || (end && ch == '\n'))
39 // huh, does fgets discard prior data on error like this?
40 // I don't think so....
45 linebuf = xrealloc(linebuf, idx + 1);
51 /* Get line, including trailing \n if any */
52 char* FAST_FUNC xmalloc_fgets(FILE *file)
56 return bb_get_chunk_from_file(file, &i);
59 /* Get line. Remove trailing \n */
60 char* FAST_FUNC xmalloc_fgetline(FILE *file)
63 char *c = bb_get_chunk_from_file(file, &i);
65 if (i && c[--i] == '\n')
71 /* Faster routines (~twice as fast). +170 bytes. Unused as of 2008-07.
73 * NB: they stop at NUL byte too.
74 * Performance is important here. Think "grep 50gigabyte_file"...
75 * Iironically, grep can't use it because of NUL issue.
76 * We sorely need C lib to provide fgets which reports size!
79 static char* xmalloc_fgets_internal(FILE *file, int *sizep)
88 linebuf = xrealloc(linebuf, idx + 0x100);
89 r = fgets(&linebuf[idx], 0x100, file);
91 /* need to terminate in case this is error
92 * (EOF puts NUL itself) */
96 /* stupid. fgets knows the len, it should report it somehow */
97 len = strlen(&linebuf[idx]);
99 if (len != 0xff || linebuf[idx - 1] == '\n')
104 /* xrealloc(linebuf, idx + 1) is up to caller */
111 /* Get line, remove trailing \n */
112 char* FAST_FUNC xmalloc_fgetline_fast(FILE *file)
115 char *r = xmalloc_fgets_internal(file, &sz);
116 if (r && r[sz - 1] == '\n')
118 return r; /* not xrealloc(r, sz + 1)! */
122 char* FAST_FUNC xmalloc_fgets(FILE *file)
125 return xmalloc_fgets_internal(file, &sz);
128 /* Get line, remove trailing \n */
129 char* FAST_FUNC xmalloc_fgetline(FILE *file)
132 char *r = xmalloc_fgets_internal(file, &sz);
135 if (r[sz - 1] == '\n')
137 return xrealloc(r, sz + 1);