[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Utility routines.
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| 4 | *
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| 5 | * Copyright (C) 2005, 2006 Rob Landley <rob@landley.net>
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| 6 | * Copyright (C) 2004 Erik Andersen <andersen@codepoet.org>
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| 7 | * Copyright (C) 2001 Matt Krai
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| 8 | *
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[2725] | 9 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[821] | 10 | */
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| 11 |
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| 12 | #include "libbb.h"
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| 13 |
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[3232] | 14 | char* FAST_FUNC bb_get_chunk_from_file(FILE *file, int *end)
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[821] | 15 | {
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| 16 | int ch;
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[3232] | 17 | unsigned idx = 0;
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[821] | 18 | char *linebuf = NULL;
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| 19 |
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| 20 | while ((ch = getc(file)) != EOF) {
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| 21 | /* grow the line buffer as necessary */
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[3232] | 22 | if (!(idx & 0xff))
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| 23 | linebuf = xrealloc(linebuf, idx + 0x100);
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[821] | 24 | linebuf[idx++] = (char) ch;
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[3232] | 25 | if (ch == '\0')
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[821] | 26 | break;
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[3232] | 27 | if (end && ch == '\n')
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| 28 | break;
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[821] | 29 | }
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| 30 | if (end)
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| 31 | *end = idx;
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| 32 | if (linebuf) {
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[1765] | 33 | // huh, does fgets discard prior data on error like this?
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| 34 | // I don't think so....
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| 35 | //if (ferror(file)) {
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| 36 | // free(linebuf);
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| 37 | // return NULL;
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| 38 | //}
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[2725] | 39 | linebuf = xrealloc(linebuf, idx + 1);
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[1765] | 40 | linebuf[idx] = '\0';
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[821] | 41 | }
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| 42 | return linebuf;
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| 43 | }
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| 44 |
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[1765] | 45 | /* Get line, including trailing \n if any */
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[2725] | 46 | char* FAST_FUNC xmalloc_fgets(FILE *file)
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[821] | 47 | {
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| 48 | int i;
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| 49 |
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| 50 | return bb_get_chunk_from_file(file, &i);
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| 51 | }
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[1765] | 52 | /* Get line. Remove trailing \n */
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[2725] | 53 | char* FAST_FUNC xmalloc_fgetline(FILE *file)
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[821] | 54 | {
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| 55 | int i;
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| 56 | char *c = bb_get_chunk_from_file(file, &i);
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| 57 |
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| 58 | if (i && c[--i] == '\n')
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[1765] | 59 | c[i] = '\0';
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[821] | 60 |
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| 61 | return c;
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| 62 | }
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[2725] | 63 |
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| 64 | #if 0
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| 65 | /* GNUism getline() should be faster (not tested) than a loop with fgetc */
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| 66 |
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| 67 | /* Get line, including trailing \n if any */
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| 68 | char* FAST_FUNC xmalloc_fgets(FILE *file)
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| 69 | {
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| 70 | char *res_buf = NULL;
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| 71 | size_t res_sz;
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| 72 |
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| 73 | if (getline(&res_buf, &res_sz, file) == -1) {
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| 74 | free(res_buf); /* uclibc allocates a buffer even on EOF. WTF? */
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| 75 | res_buf = NULL;
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| 76 | }
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| 77 | //TODO: trimming to res_sz?
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| 78 | return res_buf;
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| 79 | }
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| 80 | /* Get line. Remove trailing \n */
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| 81 | char* FAST_FUNC xmalloc_fgetline(FILE *file)
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| 82 | {
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| 83 | char *res_buf = NULL;
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| 84 | size_t res_sz;
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| 85 |
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| 86 | res_sz = getline(&res_buf, &res_sz, file);
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| 87 |
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| 88 | if ((ssize_t)res_sz != -1) {
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| 89 | if (res_buf[res_sz - 1] == '\n')
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| 90 | res_buf[--res_sz] = '\0';
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| 91 | //TODO: trimming to res_sz?
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| 92 | } else {
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| 93 | free(res_buf); /* uclibc allocates a buffer even on EOF. WTF? */
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| 94 | res_buf = NULL;
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| 95 | }
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| 96 | return res_buf;
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| 97 | }
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| 98 |
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| 99 | #endif
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| 100 |
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| 101 | #if 0
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| 102 | /* Faster routines (~twice as fast). +170 bytes. Unused as of 2008-07.
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| 103 | *
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| 104 | * NB: they stop at NUL byte too.
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| 105 | * Performance is important here. Think "grep 50gigabyte_file"...
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| 106 | * Ironically, grep can't use it because of NUL issue.
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| 107 | * We sorely need C lib to provide fgets which reports size!
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| 108 | *
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| 109 | * Update:
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| 110 | * Actually, uclibc and glibc have it. man getline. It's GNUism,
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| 111 | * but very useful one (if it's as fast as this code).
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| 112 | * TODO:
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| 113 | * - currently, sed and sort use bb_get_chunk_from_file and heavily
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| 114 | * depend on its "stop on \n or \0" behavior, and STILL they fail
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| 115 | * to handle all cases with embedded NULs correctly. So:
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| 116 | * - audit sed and sort; convert them to getline FIRST.
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| 117 | * - THEN ditch bb_get_chunk_from_file, replace it with getline.
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| 118 | * - provide getline implementation for non-GNU systems.
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| 119 | */
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| 120 |
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| 121 | static char* xmalloc_fgets_internal(FILE *file, int *sizep)
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| 122 | {
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| 123 | int len;
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| 124 | int idx = 0;
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| 125 | char *linebuf = NULL;
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| 126 |
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| 127 | while (1) {
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| 128 | char *r;
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| 129 |
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| 130 | linebuf = xrealloc(linebuf, idx + 0x100);
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| 131 | r = fgets(&linebuf[idx], 0x100, file);
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| 132 | if (!r) {
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| 133 | /* need to terminate in case this is error
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| 134 | * (EOF puts NUL itself) */
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| 135 | linebuf[idx] = '\0';
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| 136 | break;
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| 137 | }
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| 138 | /* stupid. fgets knows the len, it should report it somehow */
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| 139 | len = strlen(&linebuf[idx]);
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| 140 | idx += len;
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| 141 | if (len != 0xff || linebuf[idx - 1] == '\n')
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| 142 | break;
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| 143 | }
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| 144 | *sizep = idx;
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| 145 | if (idx) {
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| 146 | /* xrealloc(linebuf, idx + 1) is up to caller */
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| 147 | return linebuf;
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| 148 | }
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| 149 | free(linebuf);
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| 150 | return NULL;
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| 151 | }
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| 152 |
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| 153 | /* Get line, remove trailing \n */
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| 154 | char* FAST_FUNC xmalloc_fgetline_fast(FILE *file)
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| 155 | {
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| 156 | int sz;
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| 157 | char *r = xmalloc_fgets_internal(file, &sz);
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| 158 | if (r && r[sz - 1] == '\n')
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| 159 | r[--sz] = '\0';
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| 160 | return r; /* not xrealloc(r, sz + 1)! */
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| 161 | }
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| 162 |
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| 163 | char* FAST_FUNC xmalloc_fgets(FILE *file)
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| 164 | {
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| 165 | int sz;
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| 166 | return xmalloc_fgets_internal(file, &sz);
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| 167 | }
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| 168 |
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| 169 | /* Get line, remove trailing \n */
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| 170 | char* FAST_FUNC xmalloc_fgetline(FILE *file)
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| 171 | {
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| 172 | int sz;
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| 173 | char *r = xmalloc_fgets_internal(file, &sz);
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| 174 | if (!r)
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| 175 | return r;
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| 176 | if (r[sz - 1] == '\n')
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| 177 | r[--sz] = '\0';
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| 178 | return xrealloc(r, sz + 1);
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| 179 | }
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| 180 | #endif
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