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parse_config: use getline. BIG speedup with glibc (~40%).

Browse Source 
function                                             old     new   delta
config_read                                          559     604     +45
getline                                                -      23     +23
config_close                                          29      49     +20
find_pair                                            169     187     +18
showmode                                             330     338      +8
hash_find                                            233     234      +1
builtin_umask                                        133     132      -1
lzo1x_optimize                                      1434    1429      -5
test_main                                            253     247      -6
buffer_fill_and_print                                196     179     -17
create_J                                            1849    1826     -23
config_free_data                                      37       -     -37
------------------------------------------------------------------------------
(add/remove: 3/1 grow/shrink: 5/5 up/down: 138/-89)            Total: 26 bytes

Signed-off-by: Timo Teras <timo.teras@iki.fi>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Timo Teras 2011-06-20 09:49:56 +02:00 committed by Denys Vlasenko
parent e12e0acb92
commit adcabf3235
2 changed files with 44 additions and 49 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/libbb.h
View File

@ -1184,8 +1184,9 @@ enum {
};
typedef struct parser_t {
FILE *fp;
char *line;
char *data;
char *line, *nline;
size_t line_alloc, nline_alloc;
int lineno;
} parser_t;
parser_t* config_open(const char *filename) FAST_FUNC;

90
libbb/parse_config.c
View File

@ -83,60 +83,55 @@ parser_t* FAST_FUNC config_open(const char *filename)
return config_open2(filename, fopen_or_warn_stdin);
}
static void config_free_data(parser_t *parser)
{
free(parser->line);
parser->line = NULL;
if (PARSE_KEEP_COPY) { /* compile-time constant */
free(parser->data);
parser->data = NULL;
}
}
void FAST_FUNC config_close(parser_t *parser)
{
if (parser) {
config_free_data(parser);
if (PARSE_KEEP_COPY) /* compile-time constant */
free(parser->data);
fclose(parser->fp);
free(parser->line);
free(parser->nline);
free(parser);
}
}
/* This function reads an entire line from a text file, up to a newline
* or NUL byte, exclusive. It returns a malloc'ed char*.
* *lineno is incremented for each line.
/* This function reads an entire line from a text file,
* up to a newline, exclusive.
* Trailing '\' is recognized as line continuation.
* Returns NULL if EOF/error.
* Returns -1 if EOF/error.
*/
static char* get_line_with_continuation(FILE *file, int *lineno)
static int get_line_with_continuation(parser_t *parser)
{
int ch;
unsigned idx = 0;
char *linebuf = NULL;
ssize_t len, nlen;
char *line;
while ((ch = getc(file)) != EOF) {
/* grow the line buffer as necessary */
if (!(idx & 0xff))
linebuf = xrealloc(linebuf, idx + 0x101);
if (ch == '\n')
ch = '\0';
linebuf[idx] = (char) ch;
if (ch == '\0') {
(*lineno)++;
if (idx == 0 || linebuf[idx-1] != '\\')
break;
idx--; /* go back to '/' */
continue;
len = getline(&parser->line, &parser->line_alloc, parser->fp);
if (len <= 0)
return len;
line = parser->line;
for (;;) {
parser->lineno++;
if (line[len - 1] == '\n')
len--;
if (len == 0 || line[len - 1] != '\\')
break;
len--;
nlen = getline(&parser->nline, &parser->nline_alloc, parser->fp);
if (nlen <= 0)
break;
if (parser->line_alloc < len + nlen + 1) {
parser->line_alloc = len + nlen + 1;
line = parser->line = xrealloc(line, parser->line_alloc);
}
idx++;
memcpy(&line[len], parser->nline, nlen);
len += nlen;
}
if (ch == EOF) {
/* handle corner case when the file is not ended with '\n' */
(*lineno)++;
if (linebuf)
linebuf[idx] = '\0';
}
return linebuf;
line[len] = '\0';
return len;
}
@ -176,15 +171,14 @@ int FAST_FUNC config_read(parser_t *parser, char **tokens, unsigned flags, const
ntokens = (uint8_t)flags;
mintokens = (uint8_t)(flags >> 8);
again:
again:
memset(tokens, 0, sizeof(tokens[0]) * ntokens);
config_free_data(parser);
/* Read one line (handling continuations with backslash) */
line = get_line_with_continuation(parser->fp, &parser->lineno);
if (line == NULL)
if (get_line_with_continuation(parser) < 0)
return 0;
parser->line = line;
line = parser->line;
/* Skip token in the start of line? */
if (flags & PARSE_TRIM)
@ -193,8 +187,10 @@ again:
if (line[0] == '\0' || line[0] == delims[0])
goto again;
if (flags & PARSE_KEEP_COPY)
if (flags & PARSE_KEEP_COPY) {
free(parser->data);
parser->data = xstrdup(line);
}
/* Tokenize the line */
t = 0;
@ -240,8 +236,6 @@ again:
parser->lineno, t, mintokens);
if (flags & PARSE_MIN_DIE)
xfunc_die();
if (flags & PARSE_KEEP_COPY)
free(parser->data);
goto again;
}