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authorDenis Vlasenko2008-07-22 10:34:46 +0000
committerDenis Vlasenko2008-07-22 10:34:46 +0000
commit9e3a540b1beb135ff446731209cb35a78854ee88 (patch)
tree3ec5032293faf7d110dbd0a1bd214aebf398507a /coreutils/cut.c
parenta5254032f57627fa3b9b9acebc6bdd0a6e02955f (diff)
downloadbusybox-9e3a540b1beb135ff446731209cb35a78854ee88.zip
busybox-9e3a540b1beb135ff446731209cb35a78854ee88.tar.gz
cut: stop using static data. This alone removed ~70 bytes of code.
+ some optimizations function old new delta nlists 4 - -4 cut_lists 4 - -4 cut_main 1041 960 -81
Diffstat (limited to 'coreutils/cut.c')
-rw-r--r--coreutils/cut.c53
1 files changed, 30 insertions, 23 deletions
diff --git a/coreutils/cut.c b/coreutils/cut.c
index 3bac151..0d95ff8 100644
--- a/coreutils/cut.c
+++ b/coreutils/cut.c
@@ -33,11 +33,6 @@ enum {
NON_RANGE = -1
};
-/* growable array holding a series of lists */
-static struct cut_list *cut_lists;
-static unsigned int nlists; /* number of elements in above list */
-
-
static int cmpfunc(const void *a, const void *b)
{
return (((struct cut_list *) a)->startpos -
@@ -45,18 +40,19 @@ static int cmpfunc(const void *a, const void *b)
}
-static void cut_file(FILE *file, char delim)
+static void cut_file(FILE *file, char delim, const struct cut_list *cut_lists, unsigned nlists)
{
- char *line = NULL;
- unsigned int linenum = 0; /* keep these zero-based to be consistent */
+ char *line;
+ unsigned linenum = 0; /* keep these zero-based to be consistent */
/* go through every line in the file */
while ((line = xmalloc_fgetline(file)) != NULL) {
/* set up a list so we can keep track of what's been printed */
- char * printed = xzalloc(strlen(line) * sizeof(char));
- char * orig_line = line;
- unsigned int cl_pos = 0;
+ int linelen = strlen(line);
+ char *printed = xzalloc(linelen * sizeof(char));
+ char *orig_line = line;
+ unsigned cl_pos = 0;
int spos;
/* cut based on chars/bytes XXX: only works when sizeof(char) == byte */
@@ -64,15 +60,19 @@ static void cut_file(FILE *file, char delim)
/* print the chars specified in each cut list */
for (; cl_pos < nlists; cl_pos++) {
spos = cut_lists[cl_pos].startpos;
- while (spos < (int)strlen(line)) {
+ while (spos < linelen) {
if (!printed[spos]) {
printed[spos] = 'X';
putchar(line[spos]);
}
spos++;
if (spos > cut_lists[cl_pos].endpos
- || cut_lists[cl_pos].endpos == NON_RANGE)
+ /* NON_RANGE is -1, so if below is true,
+ * the above was true too (spos is >= 0) */
+ /* || cut_lists[cl_pos].endpos == NON_RANGE */
+ ) {
break;
+ }
}
}
} else if (delim == '\n') { /* cut by lines */
@@ -89,7 +89,8 @@ static void cut_file(FILE *file, char delim)
spos++;
/* go to the next list if we're at the end of this one */
if (spos > cut_lists[cl_pos].endpos
- || cut_lists[cl_pos].endpos == NON_RANGE) {
+ || cut_lists[cl_pos].endpos == NON_RANGE
+ ) {
cl_pos++;
/* get out if there's no more lists to process */
if (cl_pos >= nlists)
@@ -148,7 +149,7 @@ static void cut_file(FILE *file, char delim)
* this is a list, and we're not at the end of that
* list */
} while (spos <= cut_lists[cl_pos].endpos && line
- && cut_lists[cl_pos].endpos != NON_RANGE);
+ && cut_lists[cl_pos].endpos != NON_RANGE);
}
}
/* if we printed anything at all, we need to finish it with a
@@ -164,17 +165,21 @@ static void cut_file(FILE *file, char delim)
int cut_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int cut_main(int argc UNUSED_PARAM, char **argv)
{
+ /* growable array holding a series of lists */
+ struct cut_list *cut_lists = NULL;
+ unsigned nlists = 0; /* number of elements in above list */
char delim = '\t'; /* delimiter, default is tab */
char *sopt, *ltok;
+ unsigned opt;
opt_complementary = "b--bcf:c--bcf:f--bcf";
- getopt32(argv, optstring, &sopt, &sopt, &sopt, &ltok);
+ opt = getopt32(argv, optstring, &sopt, &sopt, &sopt, &ltok);
// argc -= optind;
argv += optind;
- if (!(option_mask32 & (CUT_OPT_BYTE_FLGS | CUT_OPT_CHAR_FLGS | CUT_OPT_FIELDS_FLGS)))
+ if (!(opt & (CUT_OPT_BYTE_FLGS | CUT_OPT_CHAR_FLGS | CUT_OPT_FIELDS_FLGS)))
bb_error_msg_and_die("expected a list of bytes, characters, or fields");
- if (option_mask32 & CUT_OPT_DELIM_FLGS) {
+ if (opt & CUT_OPT_DELIM_FLGS) {
if (ltok[0] && ltok[1]) { /* more than 1 char? */
bb_error_msg_and_die("the delimiter must be a single character");
}
@@ -182,10 +187,10 @@ int cut_main(int argc UNUSED_PARAM, char **argv)
}
/* non-field (char or byte) cutting has some special handling */
- if (!(option_mask32 & CUT_OPT_FIELDS_FLGS)) {
+ if (!(opt & CUT_OPT_FIELDS_FLGS)) {
static const char _op_on_field[] ALIGN1 = " only when operating on fields";
- if (option_mask32 & CUT_OPT_SUPPRESS_FLGS) {
+ if (opt & CUT_OPT_SUPPRESS_FLGS) {
bb_error_msg_and_die
("suppressing non-delimited lines makes sense%s",
_op_on_field);
@@ -231,8 +236,8 @@ int cut_main(int argc UNUSED_PARAM, char **argv)
e = EOL;
} else {
e = xatoi_u(ltok);
- /* if the user specified and end position of 0, that means "til the
- * end of the line */
+ /* if the user specified and end position of 0,
+ * that means "til the end of the line" */
if (e == 0)
e = EOL;
e--; /* again, arrays are zero based, lines are 1 based */
@@ -242,6 +247,8 @@ int cut_main(int argc UNUSED_PARAM, char **argv)
/* add the new list */
cut_lists = xrealloc_vector(cut_lists, 4, nlists);
+ /* NB: startpos is always >= 0,
+ * while endpos may be = NON_RANGE (-1) */
cut_lists[nlists].startpos = s;
cut_lists[nlists].endpos = e;
nlists++;
@@ -269,7 +276,7 @@ int cut_main(int argc UNUSED_PARAM, char **argv)
retval = EXIT_FAILURE;
continue;
}
- cut_file(file, delim);
+ cut_file(file, delim, cut_lists, nlists);
fclose_if_not_stdin(file);
} while (*++argv);