From 4e4ef99b1f7257e4fc10075bdc03196ed31cbdee Mon Sep 17 00:00:00 2001
From: Abigail <abigail@abigail.be>
Date: Fri, 22 Jan 2021 12:56:35 +0100
Subject: We only need one pointer.

There's no need for a different pointer when searching for the
beginning of the word, nor do we need strcpy to extract words
before printing it. Instead, we set the first white space after
a word to '\0', walk the pointer to the beginning of the word,
then print it.
---
 challenge-096/abigail/c/ch-1.c | 42 ++++++++++++++----------------------------
 1 file changed, 14 insertions(+), 28 deletions(-)

diff --git a/challenge-096/abigail/c/ch-1.c b/challenge-096/abigail/c/ch-1.c
index 36ec37d5fb..b01e726173 100644
--- a/challenge-096/abigail/c/ch-1.c
+++ b/challenge-096/abigail/c/ch-1.c
@@ -8,63 +8,49 @@
 
 # include <stdlib.h>
 # include <stdio.h>
-# include <string.h>
 # include <ctype.h>
 
 int main (void) {
     char *  line    = NULL;
     size_t  len     = 0;
-    size_t  strlen;
+    size_t  ptr;
 
-    while ((strlen = getline (&line, &len, stdin)) != -1) {
-        char * line_ptr = line;
-        size_t end = strlen;
-        size_t begin;
+    while ((ptr = getline (&line, &len, stdin)) != -1) {
         size_t output = 0;
-        while (end > 0) {
+        while (ptr > 0) {
             /*
              * Skip tailing whitespace
              */
-            while (end > 0 && isspace (line [end - 1])) {
-                end --;
+            while (ptr > 0 && isspace (line [ptr - 1])) {
+                ptr --;
             }
 
             /*
-             * 'end' now just after the end of a word, or
+             * 'ptr' is now just after the end of a word, or
              * at the beginning of the string; if the latter,
              * there is nothing left to print.
              */
-
-            if (end <= 0) {
+            if (ptr <= 0) {
                 break;
             }
 
             /*
-             * Find the beginning of a word
+             * Terminate the string just after the newly found word
              */
-            begin = end - 1;
-            while (begin > 0 && !isspace (line [begin - 1])) {
-                begin --;
-            }
+            line [ptr] = '\0';
 
             /*
-             * Extract the word out of the string: allocate memory,
-             * and copy the right part of the input.
+             * Find the beginning of that word
              */
-            char * word;
-            if ((word = malloc ((end - begin + 1) * sizeof (char))) == NULL) {
-                fprintf (stderr, "Out of memory\n");
-                exit (1);
+            while (ptr > 0 && !isspace (line [ptr - 1])) {
+                ptr --;
             }
-            stpncpy (word, line + begin, end - begin);
 
             /*
-             * Print the string, prepended (except the first printed word)
+             * Print the word, prepended (except the first printed word)
              * by a space.
              */
-            printf ("%s%s", output ++ ? " " : "", word);
-
-            end = begin;
+            printf ("%s%s", output ++ ? " " : "", &line [ptr]);
         }
         printf ("\n");
     }
-- 
cgit