First pass of cut cleanup, and make test script slightly happier with the concept of 80 character lines.

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;
 }