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-rw-r--r--toys/posix/cut.c166
1 files changed, 64 insertions, 102 deletions
diff --git a/toys/posix/cut.c b/toys/posix/cut.c
index 6f813102..abf944de 100644
--- a/toys/posix/cut.c
+++ b/toys/posix/cut.c
@@ -3,8 +3,8 @@
* Copyright 2012 Ranjan Kumar <ranjankumar.bth@gmail.com>, Kyungwan Han <asura321@gamil.com>
*
* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/cut.html
- *
-USE_CUT(NEWTOY(cut, "b:c:f:d:sn", TOYFLAG_BIN))
+
+USE_CUT(NEWTOY(cut, "b:|c:|f:|d:sn[!cbf]", TOYFLAG_BIN))
config CUT
bool "cut"
@@ -26,7 +26,7 @@ typedef struct _slist {
int start_position;
int end_position;
struct _slist *next;
-}SLIST;
+} SLIST;
GLOBALS(
char *delim;
@@ -37,11 +37,6 @@ GLOBALS(
unsigned nelem;
)
-#define BEGINOFLINE 0
-#define ENDOFLINE INT_MAX
-#define NORANGE -1
-
-static int get_user_options(void);
void (*do_cut)(int);
static void do_fcut(int fd);
static void do_bccut(int fd);
@@ -64,8 +59,7 @@ static void add_to_list(int start, int end)
if (head_ref == NULL || (head_ref)->start_position >= start) {
temp1_node->next = head_ref;
head_ref = temp1_node;
- }
- else {
+ } else {
/* Locate the node before the point of insertion */
current = head_ref;
while (current->next!=NULL && current->next->start_position < temp1_node->start_position)
@@ -74,41 +68,37 @@ static void add_to_list(int start, int end)
current->next = temp1_node;
}
TT.slist_head = head_ref;
- return;
}
-/*
- * parse list and add to slist.
- */
+// parse list and add to slist.
static void parse_list(char *list)
{
- char *ctoken, *dtoken;
- int start = 0, end = 0;
- while((ctoken = strsep(&list, ",")) != NULL) {
- if(!ctoken[0]) continue;
+ for (;;) {
+ char *ctoken = strsep(&list, ","), *dtoken;
+ int start = 0, end = INT_MAX;
+
+ if (!ctoken) break;
+ if (!*ctoken) continue;
//Get start position.
- dtoken = strsep(&ctoken, "-");
- if(!dtoken[0]) start = BEGINOFLINE;
- else {
+ if (*(dtoken = strsep(&ctoken, "-"))) {
start = get_int_value(dtoken, 0, INT_MAX);
start = (start?(start-1):start);
}
+
//Get end position.
- if(ctoken == NULL) end = NORANGE; //case e.g. 1,2,3
- else if(!ctoken[0]) end = ENDOFLINE; //case e.g. N-
- else {//case e.g. N-M
+ if (!ctoken) end = -1; //case e.g. 1,2,3
+ else if (*ctoken) {//case e.g. N-M
end = get_int_value(ctoken, 0, INT_MAX);
- end = (end?end:ENDOFLINE);
- end--;
- if(end == start) end = NORANGE;
+ if (!end) end = INT_MAX;
+ end--;
+ if(end == start) end = -1;
}
add_to_list(start, end);
TT.nelem++;
}
//if list is missing in command line.
- if(TT.nelem == 0) error_exit("missing positions list:");
- return;
+ if (!TT.nelem) error_exit("missing positions list");
}
/*
@@ -134,78 +124,68 @@ static void get_data(void)
}
}
}
- return;
}
-/*
- * cut main function.
-*/
void cut_main(void)
{
char delimiter = '\t'; //default delimiter.
- int num_of_options = 0;
char *list;
TT.nelem = 0;
TT.slist_head = NULL;
- //verify the number of options provided by user.
- num_of_options = get_user_options();
- if(num_of_options == 0) error_exit("specify a list of bytes, characters, or fields");
- else if(num_of_options > 1) error_exit("only one type of list may be specified");
//Get list and assign the function.
- if(toys.optflags & FLAG_f) {
+ if (toys.optflags & FLAG_f) {
list = TT.flist;
do_cut = do_fcut;
- }
- else if(toys.optflags & FLAG_c) {
+ } else if (toys.optflags & FLAG_c) {
list = TT.clist;
do_cut = do_bccut;
- }
- else {
+ } else {
list = TT.blist;
do_cut = do_bccut;
}
- if(toys.optflags & FLAG_d) {
+ if (toys.optflags & FLAG_d) {
//delimiter must be 1 char.
- if(TT.delim[0] && TT.delim[1]) perror_exit("the delimiter must be a single character");
+ if(TT.delim[0] && TT.delim[1])
+ perror_exit("the delimiter must be a single character");
delimiter = TT.delim[0];
}
if(!(toys.optflags & FLAG_d) && (toys.optflags & FLAG_f)) {
- TT.delim = (char *)xzalloc(2);
+ TT.delim = xzalloc(2);
TT.delim[0] = delimiter;
}
//when field is not specified, cutting has some special handling.
- if(!(toys.optflags & FLAG_f)) {
- if(toys.optflags & FLAG_s) perror_exit("suppressing non-delimited lines operating on fields");
- if(delimiter != '\t') perror_exit("an input delimiter may be specified only when operating on fields");
+ if (!(toys.optflags & FLAG_f)) {
+ if (toys.optflags & FLAG_s)
+ perror_exit("suppressing non-delimited lines operating on fields");
+ if (delimiter != '\t')
+ perror_exit("an input delimiter may be specified only when operating on fields");
}
parse_list(list);
get_data();
- if(!(toys.optflags & FLAG_d) && (toys.optflags & FLAG_f)) {
+ if (!(toys.optflags & FLAG_d) && (toys.optflags & FLAG_f)) {
free(TT.delim);
TT.delim = NULL;
}
free_list();
- return;
}
-/*
- * perform cut operation on the given delimiter.
- */
+// perform cut operation on the given delimiter.
static void do_fcut(int fd)
{
char *buff;
char *delimiter = TT.delim;
- while((buff = get_line(fd)) != NULL) {
+
+ while ((buff = get_line(fd))) {
//does line have any delimiter?.
- if(strrchr(buff, (int)delimiter[0]) == NULL) {
+ if (strrchr(buff, (int)delimiter[0]) == NULL) {
//if not then print whole line and move to next line.
- if(!(toys.optflags & FLAG_s)) xputs(buff);
+ if (!(toys.optflags & FLAG_s)) xputs(buff);
continue;
}
@@ -215,34 +195,33 @@ static void do_fcut(int fd)
char *pfield = xzalloc(strlen(buff) + 1);
SLIST *temp_node = TT.slist_head;
- if(temp_node != NULL) {
+ if (temp_node != NULL) {
//process list on each line.
- while(cpos < TT.nelem && buff) {
- if(!temp_node) break;
+ while (cpos < TT.nelem && buff) {
+ if (!temp_node) break;
start = temp_node->start_position;
do {
char *field = NULL;
//count number of delimeters per line.
- while(buff) {
- if(ndelimiters < start) {
+ while (buff) {
+ if (ndelimiters < start) {
ndelimiters++;
field = strsep(&buff, delimiter);
- }
- else break;
+ } else break;
}
//print field (if not yet printed).
- if(!pfield[ndelimiters]) {
- if(ndelimiters == start) {
+ if (!pfield[ndelimiters]) {
+ if (ndelimiters == start) {
//put delimiter.
- if(nprinted_fields++ > 0) xputc(delimiter[0]);
- if(field) fputs(field, stdout);
+ if (nprinted_fields++ > 0) xputc(delimiter[0]);
+ if (field) fputs(field, stdout);
//make sure this field won't print again.
pfield[ndelimiters] = (char) 0x23; //put some char at this position.
}
}
start++;
- if((temp_node->end_position == NORANGE) || (!buff)) break;
- }while(start <= temp_node->end_position);
+ if ((temp_node->end_position < 0) || (!buff)) break;
+ } while(start <= temp_node->end_position);
temp_node = temp_node->next;
cpos++;
}
@@ -251,38 +230,37 @@ static void do_fcut(int fd)
free(pfield);
pfield = NULL;
}//End of while loop.
- return;
}
-/*
- * perform cut operation char or byte.
- */
+// perform cut operation char or byte.
static void do_bccut(int fd)
{
char *buff;
- while((buff = get_line(fd)) != NULL) {
+
+ while ((buff = get_line(fd)) != NULL) {
unsigned cpos = 0;
int buffln = strlen(buff);
char *pfield = xzalloc(buffln + 1);
SLIST *temp_node = TT.slist_head;
- if(temp_node != NULL) {
- while(cpos < TT.nelem) {
+
+ if (temp_node != NULL) {
+ while (cpos < TT.nelem) {
int start;
- if(!temp_node) break;
+
+ if (!temp_node) break;
start = temp_node->start_position;
- while(start < buffln) {
+ while (start < buffln) {
//to avoid duplicate field printing.
- if(pfield[start]) {
- if(++start <= temp_node->end_position) continue;
+ if (pfield[start]) {
+ if (++start <= temp_node->end_position) continue;
temp_node = temp_node->next;
break;
- }
- else {
+ } else {
//make sure this field won't print again.
pfield[start] = (char) 0x23; //put some char at this position.
xputc(buff[start]);
}
- if(++start > temp_node->end_position) {
+ if (++start > temp_node->end_position) {
temp_node = temp_node->next;
break;
}
@@ -294,22 +272,6 @@ static void do_bccut(int fd)
free(pfield);
pfield = NULL;
}
- return;
-}
-
-/*
- * used to verify "c", "b" and "f" options are present in command line.
- * As cut command can only except any of them at a time.
-*/
-static int get_user_options(void)
-{
- int i = 3, flag = 0;
- for(; i<6; i++) {//verify 3rd, 4th and 5th bit is set.
- int mask = 1;
- mask = mask << i;
- if(toys.optflags & mask) flag++;
- }
- return flag;
}
/*
@@ -318,10 +280,10 @@ static int get_user_options(void)
static void free_list(void)
{
SLIST *temp;
- while(TT.slist_head != NULL) {
+
+ while (TT.slist_head != NULL) {
temp = TT.slist_head->next;
free(TT.slist_head);
TT.slist_head = temp;
}
- return;
}
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