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-rw-r--r--toys/posix/cut.c106
1 files changed, 46 insertions, 60 deletions
diff --git a/toys/posix/cut.c b/toys/posix/cut.c
index 38f136e2..b23535c3 100644
--- a/toys/posix/cut.c
+++ b/toys/posix/cut.c
@@ -1,6 +1,7 @@
/* cut.c - Cut from a file.
*
- * Copyright 2012 Ranjan Kumar <ranjankumar.bth@gmail.com>, Kyungwan Han <asura321@gamil.com>
+ * Copyright 2012 Ranjan Kumar <ranjankumar.bth@gmail.com>
+ * Copyright 2012 Kyungwan Han <asura321@gmail.com>
*
* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/cut.html
@@ -14,57 +15,52 @@ config CUT
Print selected parts of lines from each FILE to standard output.
- -b LIST select only these bytes from LIST.
- -c LIST select only these characters from LIST.
- -f LIST select only these fields.
- -d DELIM use DELIM instead of TAB for field delimiter.
- -s do not print lines not containing delimiters.
- -n don't split multibyte characters (Ignored).
+ -b LIST select only these bytes from LIST.
+ -c LIST select only these characters from LIST.
+ -f LIST select only these fields.
+ -d DELIM use DELIM instead of TAB for field delimiter.
+ -s do not print lines not containing delimiters.
+ -n don't split multibyte characters (Ignored).
*/
#define FOR_cut
#include "toys.h"
-typedef struct _slist {
- int start_position;
- int end_position;
- struct _slist *next;
-} SLIST;
-
GLOBALS(
char *delim;
char *flist;
char *clist;
char *blist;
- struct _slist *slist_head;
+
+ void *slist_head;
unsigned nelem;
)
+struct slist {
+ struct slist *next;
+ int start, end;
+};
+
void (*do_cut)(int);
static void do_fcut(int fd);
static void do_bccut(int fd);
-static void free_list(void);
-/*
- * add items in the slist.
- */
static void add_to_list(int start, int end)
{
- SLIST *current, *head_ref, *temp1_node;
+ struct slist *current, *head_ref, *temp1_node;
head_ref = TT.slist_head;
- temp1_node = (SLIST *)xzalloc(sizeof(SLIST));
- temp1_node->start_position = start;
- temp1_node->end_position = end;
- temp1_node->next = NULL;
+ temp1_node = xzalloc(sizeof(struct slist));
+ temp1_node->start = start;
+ temp1_node->end = end;
/* Special case for the head end */
- if (head_ref == NULL || (head_ref)->start_position >= start) {
+ if (!head_ref || head_ref->start >= start) {
temp1_node->next = head_ref;
head_ref = temp1_node;
} else {
/* Locate the node before the point of insertion */
current = head_ref;
- while (current->next!=NULL && current->next->start_position < temp1_node->start_position)
+ while (current->next && current->next->start < temp1_node->start)
current = current->next;
temp1_node->next = current->next;
current->next = temp1_node;
@@ -174,16 +170,25 @@ void cut_main(void)
free(TT.delim);
TT.delim = NULL;
}
- free_list();
+ llist_traverse(TT.slist_head, free);
}
// perform cut operation on the given delimiter.
static void do_fcut(int fd)
{
- char *buff;
- char *delimiter = TT.delim;
+ char *buff, *pfield = 0, *delimiter = TT.delim;
+
+ for (;;) {
+ unsigned cpos = 0;
+ int start, ndelimiters = -1;
+ int nprinted_fields = 0;
+ struct slist *temp_node = TT.slist_head;
+
+ free(pfield);
+ pfield = 0;
+
+ if (!(buff = get_line(fd))) break;
- while ((buff = get_line(fd))) {
//does line have any delimiter?.
if (strrchr(buff, (int)delimiter[0]) == NULL) {
//if not then print whole line and move to next line.
@@ -191,19 +196,16 @@ static void do_fcut(int fd)
continue;
}
- unsigned cpos = 0;
- int start, ndelimiters = -1;
- int nprinted_fields = 0;
- char *pfield = xzalloc(strlen(buff) + 1);
- SLIST *temp_node = TT.slist_head;
+ pfield = xzalloc(strlen(buff) + 1);
- if (temp_node != NULL) {
+ if (temp_node) {
//process list on each line.
while (cpos < TT.nelem && buff) {
if (!temp_node) break;
- start = temp_node->start_position;
+ start = temp_node->start;
do {
- char *field = NULL;
+ char *field = 0;
+
//count number of delimeters per line.
while (buff) {
if (ndelimiters < start) {
@@ -222,16 +224,14 @@ static void do_fcut(int fd)
}
}
start++;
- if ((temp_node->end_position < 0) || (!buff)) break;
- } while(start <= temp_node->end_position);
+ if ((temp_node->end < 0) || !buff) break;
+ } while(start <= temp_node->end);
temp_node = temp_node->next;
cpos++;
}
}
xputc('\n');
- free(pfield);
- pfield = NULL;
- }//End of while loop.
+ }
}
// perform cut operation char or byte.
@@ -243,18 +243,18 @@ static void do_bccut(int fd)
unsigned cpos = 0;
int buffln = strlen(buff);
char *pfield = xzalloc(buffln + 1);
- SLIST *temp_node = TT.slist_head;
+ struct slist *temp_node = TT.slist_head;
if (temp_node != NULL) {
while (cpos < TT.nelem) {
int start;
if (!temp_node) break;
- start = temp_node->start_position;
+ start = temp_node->start;
while (start < buffln) {
//to avoid duplicate field printing.
if (pfield[start]) {
- if (++start <= temp_node->end_position) continue;
+ if (++start <= temp_node->end) continue;
temp_node = temp_node->next;
break;
} else {
@@ -262,7 +262,7 @@ static void do_bccut(int fd)
pfield[start] = (char) 0x23; //put some char at this position.
xputc(buff[start]);
}
- if (++start > temp_node->end_position) {
+ if (++start > temp_node->end) {
temp_node = temp_node->next;
break;
}
@@ -275,17 +275,3 @@ static void do_bccut(int fd)
pfield = NULL;
}
}
-
-/*
- * free the slist.
-*/
-static void free_list(void)
-{
- SLIST *temp;
-
- while (TT.slist_head != NULL) {
- temp = TT.slist_head->next;
- free(TT.slist_head);
- TT.slist_head = temp;
- }
-}