--- /dev/null
+/* depend: */
+/* cflags: */
+/* linker: */
+
+#include <assert.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+/* macros */
+
+#define VERBOSE(level, statement...) do { if (level <= verbose) { statement; } } while(0)
+
+/* gobal variables */
+
+char *progname = NULL;
+int verbose = 0;
+int nbcols = 4;
+
+char tablechars[256][4] = {
+ "NUL", "SOH", "STX", "ETX", "EOT", "ENQ", "ACK", "DEL",
+ "DS", "HT", "LF", "VT", "FF", "CR", "SO", "SI",
+ "DLE", "DC1", "DC2", "DC3", "DC4", "NAK", "SYN", "ETB",
+ "CAN", "EM", "SUB", "ESC", "FS", "GS", "RS", "US",
+ "SP", "", "", "", "", "", "", "",
+ "", "", "", "", "", "", "", "",
+ "", "", "", "", "", "", "", "",
+ "", "", "", "", "", "", "", "",
+ "", "", "", "", "", "", "", "",
+ "", "", "", "", "", "", "", "",
+ "", "", "", "", "", "", "", "",
+ "", "", "", "", "", "", "", "",
+ "", "", "", "", "", "", "", "",
+ "", "", "", "", "", "", "", "",
+ "", "", "", "", "", "", "", "",
+ "", "", "", "", "", "", "", "DEL"};
+
+/* help function */
+
+void usage (int ret)
+{
+ FILE *fd = ret ? stderr : stdout;
+ fprintf (fd, "usage: %s\n", progname);
+ fprintf (fd, " -c : number of columns (%d)\n", nbcols);
+ fprintf (fd, " -h : help message\n");
+ fprintf (fd, " -v : verbose level (%d)\n", verbose);
+
+ exit (ret);
+}
+
+/* main function */
+
+int main (int argc, char *argv[])
+{
+ int i;
+
+ progname = argv[0];
+
+ int c;
+ while ((c = getopt(argc, argv, "c:hv:")) != EOF) {
+ switch (c) {
+ case 'c':
+ nbcols = atoi (optarg);
+ break;
+ case 'v':
+ verbose = atoi (optarg);
+ break;
+ case 'h':
+ default:
+ usage (c != 'h');
+ }
+ }
+ if (argc - optind != 0) {
+ fprintf (stderr, "%s: invalid option -- %s\n", progname, argv[optind]);
+ usage (1);
+ }
+
+ for (i = 0; i < 256; i++) {
+ char line[] = " : : x";
+
+ if (i > 99) line[0] = '0' + i / 100;
+ if (i > 9) line[1] = '0' + (i / 10) % 10;
+ line[2] = '0' + i % 10;
+ line[4] = '0' + i / 16;
+ if (line[4] > '9') line[4] += 'a' - '0' - 10;
+ line[5] = '0' + i % 16;
+ if (line[5] > '9') line[5] += 'a' - '0' - 10;
+
+ if (tablechars[i][0] != '\0') {
+ int j = 0;
+ while (tablechars[i][j] != '\0') {
+ line[8 + j] = tablechars[i][j];
+ j++;
+ }
+ } else {
+ line[8] = i;
+ }
+ line[11] = (((i + 1) % nbcols == 0) || (i == 255)) ? '\n' : ' ';
+
+ write (STDOUT_FILENO, line, 12);
+ }
+
+ return 0;
+}
+
+// test: ascii.exe -h
+// test: ascii.exe -h | awk '/usage:/ { rc=1 } END { exit (1-rc) }'
+// test: ascii.exe -_ 2> /dev/null | awk 'END { if (NR == 0) { exit(0) } else exit (1) }'
+// test: ascii.exe -_ 2>&1 | awk '/usage:/ { rc=1 } END { exit (1-rc) }'
+
+/* vim: set ts=4 sw=4 et: */