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.
12 /* for getline() [GNUism] */
18 /* This function reads an entire line from a text file, up to a newline
19 * or NUL byte, inclusive. It returns a malloc'ed char * which
20 * must be free'ed by the caller. If end is NULL '\n' isn't considered
21 * end of line. If end isn't NULL, length of the chunk read is stored in it.
22 * Return NULL if EOF/error */
23 char* FAST_FUNC bb_get_chunk_from_file(FILE *file, int *end)
30 while ((ch = getc(file)) != EOF) {
31 /* grow the line buffer as necessary */
32 if (idx >= linebufsz) {
34 linebuf = xrealloc(linebuf, linebufsz);
36 linebuf[idx++] = (char) ch;
37 if (!ch || (end && ch == '\n'))
43 // huh, does fgets discard prior data on error like this?
44 // I don't think so....
49 linebuf = xrealloc(linebuf, idx + 1);
55 /* Get line, including trailing \n if any */
56 char* FAST_FUNC xmalloc_fgets(FILE *file)
60 return bb_get_chunk_from_file(file, &i);
62 /* Get line. Remove trailing \n */
63 char* FAST_FUNC xmalloc_fgetline(FILE *file)
66 char *c = bb_get_chunk_from_file(file, &i);
68 if (i && c[--i] == '\n')
76 /* GNUism getline() should be faster (not tested) than a loop with fgetc */
78 /* Get line, including trailing \n if any */
79 char* FAST_FUNC xmalloc_fgets(FILE *file)
84 if (getline(&res_buf, &res_sz, file) == -1) {
85 free(res_buf); /* uclibc allocates a buffer even on EOF. WTF? */
88 //TODO: trimming to res_sz?
91 /* Get line. Remove trailing \n */
92 char* FAST_FUNC xmalloc_fgetline(FILE *file)
97 res_sz = getline(&res_buf, &res_sz, file);
99 if ((ssize_t)res_sz != -1) {
100 if (res_buf[res_sz - 1] == '\n')
101 res_buf[--res_sz] = '\0';
102 //TODO: trimming to res_sz?
104 free(res_buf); /* uclibc allocates a buffer even on EOF. WTF? */
113 /* Faster routines (~twice as fast). +170 bytes. Unused as of 2008-07.
115 * NB: they stop at NUL byte too.
116 * Performance is important here. Think "grep 50gigabyte_file"...
117 * Ironically, grep can't use it because of NUL issue.
118 * We sorely need C lib to provide fgets which reports size!
121 * Actually, uclibc and glibc have it. man getline. It's GNUism,
122 * but very useful one (if it's as fast as this code).
124 * - currently, sed and sort use bb_get_chunk_from_file and heavily
125 * depend on its "stop on \n or \0" behavior, and STILL they fail
126 * to handle all cases with embedded NULs correctly. So:
127 * - audit sed and sort; convert them to getline FIRST.
128 * - THEN ditch bb_get_chunk_from_file, replace it with getline.
129 * - provide getline implementation for non-GNU systems.
132 static char* xmalloc_fgets_internal(FILE *file, int *sizep)
136 char *linebuf = NULL;
141 linebuf = xrealloc(linebuf, idx + 0x100);
142 r = fgets(&linebuf[idx], 0x100, file);
144 /* need to terminate in case this is error
145 * (EOF puts NUL itself) */
149 /* stupid. fgets knows the len, it should report it somehow */
150 len = strlen(&linebuf[idx]);
152 if (len != 0xff || linebuf[idx - 1] == '\n')
157 /* xrealloc(linebuf, idx + 1) is up to caller */
164 /* Get line, remove trailing \n */
165 char* FAST_FUNC xmalloc_fgetline_fast(FILE *file)
168 char *r = xmalloc_fgets_internal(file, &sz);
169 if (r && r[sz - 1] == '\n')
171 return r; /* not xrealloc(r, sz + 1)! */
174 char* FAST_FUNC xmalloc_fgets(FILE *file)
177 return xmalloc_fgets_internal(file, &sz);
180 /* Get line, remove trailing \n */
181 char* FAST_FUNC xmalloc_fgetline(FILE *file)
184 char *r = xmalloc_fgets_internal(file, &sz);
187 if (r[sz - 1] == '\n')
189 return xrealloc(r, sz + 1);