Modify README. Remove redundant assignment from overwrite.c.

Add additional error handling to overwrite.c.

README

@@ -12,5 +12,6 @@
              with fewer than the provided number of characters with the next
 	     line, so long as it doesn't cause a word-split.
     -overwrite: Reads stdin and writes it to the provided file. [done]
-    -shuf: Accepts an arbitrary number of arguments; returns one at random. 
+    -shuf: Accepts an arbitrary number of arguments; returns one at random.
+    -rand: Shell interface to the C rand() function. 
     

src/overwrite.c

@@ -14,48 +14,48 @@ int main(int argc, char **argv)
     char *buf;
     FILE *fp;
     strlen = 0;
-    buflen = 0;
     /* arbitrary */
     buflen = 4096;
 
     if(argc == 1)
-	{
-	throw(NEEDARG_FAIL, mastrcat(argv[0], " files"));
-	}
+        {
+        throw(NEEDARG_FAIL, mastrcat(argv[0], " files"));
+        }
 
     if((buf = malloc(buflen)))
-	{
-	c = 0;
-	
-	for(;((c = getchar()) != EOF);)
-	    {
-	    if(strlen == buflen)
-		{
-		buf = realloc(buf, (buflen*=2));
+        {
+        c = 0;
+        
+        for(;((c = getchar()) != EOF);)
+            {
+            if(strlen == buflen && !(buf = realloc(buf, (buflen*=2))))
+                {
+                /* realloc failed */
+		throw(MALLOC_FAIL, NULL);
 		}
-	    buf[strlen++] = c;
-	    }
+            buf[strlen++] = c;
+            }
 
-	if(!(fp = fopen(argv[1], "a")))
-	    {
-	    throw(FOPEN_FAIL, argv[1]);
-	    }
+        if(!(fp = fopen(argv[1], "a")))
+            {
+            throw(FOPEN_FAIL, argv[1]);
+            }
 
-	for(c = 0; c <= strlen; c++)
-	    {
-	    if(fputc(buf[c], fp) == EOF)
-		{
-		throw(WRITE_FAIL, argv[1]);
-		}
-	    }
+        for(c = 0; c <= strlen; c++)
+            {
+            if(fputc(buf[c], fp) == EOF)
+                {
+                throw(WRITE_FAIL, argv[1]);
+                }
+            }
 
-	/* close the file and exit successfully */
-	fclose(fp);
-	}
+        /* close the file and exit successfully */
+        fclose(fp);
+        }
     else
-	{
-	throw(MALLOC_FAIL, NULL);
-	}
+        {
+        throw(MALLOC_FAIL, NULL);
+        }
     
     return 0;
     }