heatmap.c SEGV's when stdin is closed (upstream exits 0)

[mcavage]

Take my patch. You know you'll love it:

diff --git a/heatmap.c b/heatmap.c
index 601a240..6f0fc49 100644
--- a/heatmap.c
+++ b/heatmap.c
@@ -1,5 +1,4 @@

-
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
@@ -32,7 +31,7 @@ typedef enum { B_FALSE, B_TRUE } boolean_t;

 #define    LEGEND_WIDTH    10

-#define    BUFFER_SIZE 4096
+#define    BUFFER_SIZE 65535

 #define    TITLE   "T E R M I N A L   H E A T M A P"

@@ -79,6 +78,20 @@ print_title(char *title)
 }

 void
+init_canvas()
+{
+   int i;
+   int j;
+
+   for (i = 0; i < w; i++) {
+       for (j = 0; j< h ; j++) {
+           fprintf(stdout, CSI "%d;4H", j); /* move afore the line */
+           fprintf(stdout, CSI "1P"); /* truncate on the left */
+       }
+   }
+}
+
+void
 print_time_markers(void)
 {
    int offs;
@@ -560,6 +573,7 @@ main(int argc, char **argv)
     * Set up the screen:
     */
    fprintf(stdout, CLRSCR NOCURS);
+   init_canvas();
    print_title(opt_title != NULL ? opt_title : TITLE);
    print_time_markers();

@@ -569,8 +583,13 @@ main(int argc, char **argv)
     * where each integer value will increment the bucket it fits in.
     */
    for (;;) {
-       char *buf = fgets(line_buffer, BUFFER_SIZE, stdin);
-       int *row = line_to_row(buf);
+       char *buf;
+       int *row;
+
+       if ((buf = fgets(line_buffer, BUFFER_SIZE, stdin)) == NULL)
+           exit(0);
+
+       row = line_to_row(buf);

        if (row == NULL) {
            fprintf(stdout, CLRSCR CURS);