+static char *sccsid = "@(#)ul.c 4.1 (Berkeley) %G%";
+/*
+ * ul
+ */
+#include <stdio.h>
+
+char buf[BUFSIZ];
+char isul[BUFSIZ];
+char termcap[1024];
+char ulbuf[BUFSIZ];
+char *stul, *endul, *chul;
+char *backspace;
+char *termtype;
+int outc();
+char *tgetstr();
+char *getenv();
+
+main(argc, argv)
+ int argc;
+ char **argv;
+{
+ register int i;
+ char *cp;
+ FILE *f;
+
+ argc--, argv++;
+ termtype = getenv("TERM");
+ if (termtype == NULL)
+ termtype = "dumb";
+ while (argc > 0 && argv[0][0] == '-') {
+ switch(argv[0][1]) {
+
+ case 't':
+ case 'T': /* for nroff compatibility */
+ if (argv[0][2])
+ termtype = &argv[0][2];
+ else {
+ termtype = argv[1];
+ argc--;
+ argv++;
+ }
+ break;
+ case 'i':
+ argc--, argv++;
+ iul(argc, argv);
+ exit(0);
+
+ default:
+ printf("Usage: ul [ -i ] [ -tTerm ] file...\n");
+ exit(1);
+ }
+ }
+ switch(tgetent(termcap, termtype)) {
+
+ case 1:
+ if (tgetflag("os"))
+ execv("/bin/cat",argv);
+ cp = ulbuf;
+ if ((backspace = tgetstr("bc",&cp)) == NULL)
+ backspace = "\b";
+ /*
+ * Handle terminals that have start underline/stop
+ * underline sequences, as well as those with
+ * underline char sequences (we assume the sequence
+ * moves the cursor forward one character).
+ * If we can't find underline sequences, we
+ * settle for standout sequences.
+ */
+ if ((chul=tgetstr("uc",&cp)) == NULL)
+ chul = "";
+ if ((stul=tgetstr("us",&cp)) == NULL && !tgetflag("ul") &&
+ (!*chul) && (stul=tgetstr("so",&cp)) == NULL)
+ stul = "";
+ if ((endul=tgetstr("ue",&cp)) == NULL && !tgetflag("ul") &&
+ (!*chul) && (endul=tgetstr("se",&cp)) == NULL)
+ endul = "";
+ if (chul==0&&stul==0&&endul==0&&tgetflag("ul"))
+ execv("/bin/cat",argv);
+ break;
+
+ default:
+ fprintf(stderr,"trouble reading termcap");
+ /* fall through to ... */
+
+ case 0:
+ /* No such terminal type - assume dumb */
+ stul = endul = chul = "";
+ break;
+ }
+ if (argc == 0)
+ filter(stdin);
+ else for (i=0; i<argc; i++) {
+ f = fopen(argv[i],"r");
+ if (f == NULL) {
+ perror(argv[i]);
+ exit(1);
+ } else
+ filter(f);
+ }
+ exit(0);
+}
+
+filter(f)
+FILE *f;
+{
+ register int p, n;
+ register char c;
+ int state;
+
+ n = 0;
+ for (;;) {
+ p = 0;
+ for (p=0; p<n; p++) {
+ buf[p] = '\0';
+ isul[p] = 0;
+ }
+ p = n = 0;
+
+ for (;;) {
+ c = getc(f);
+ if (c==EOF)
+ break;
+ if (c=='\b') {
+ if (p > 0) {
+ p--;
+ }
+ } else if (c=='_' && isul[p]==0 && buf[p]) {
+ isul[p] = 1;
+ p++;
+ } else {
+ if (buf[p] == '_')
+ isul[p] = 1;
+ buf[p] = c;
+ p++;
+ if (n < p)
+ n = p;
+ }
+ if (c=='\n')
+ break;
+ }
+
+ state = 0;
+ for (p=0; p<n; p++) {
+ if (isul[p] != state)
+ tputs(isul[p] ? stul : endul, 1, outc);
+ state = isul[p];
+ putchar(buf[p]);
+ if (isul[p] && *chul) {
+ printf("%s",backspace);
+ tputs(chul, 1, outc);
+ }
+ }
+ if (c==EOF) break;
+ }
+}
+
+outc(c)
+char c;
+{
+ putchar(c);
+}
+
+#define BACKSPACE 0
+#define QUOTE 0200
+
+char linebuf[BUFSIZ], genbuf[BUFSIZ];
+char *strcpy();
+
+iul(argc, argv)
+ int argc;
+ char *argv[];
+{
+ register c;
+ register char *lp;
+
+ do {
+ if (argc > 0) {
+ if (freopen(argv[0], "r", stdin) == NULL) {
+ perror(argv[0]);
+ exit(1);
+ }
+ argc--; argv++;
+ }
+ while (fgets(linebuf, sizeof linebuf, stdin) != 0) {
+ for (lp = linebuf; *lp; lp++)
+ continue;
+ *--lp = 0;
+ doulg();
+ dographic();
+ if (genbuf[0])
+ printf("\n%s", genbuf);
+ putchar('\n');
+ fflush(stdout);
+ }
+ } while (argc > 0);
+ exit(0);
+}
+
+dographic()
+{
+ register char *lp;
+ register c;
+
+ for (lp = linebuf; c = *lp++;) {
+ switch (c) {
+ case '\b':
+ if (BACKSPACE == 0)
+ c = '?';
+ break;
+ default:
+ if (c < ' ' || c == 0177)
+ c = '?';
+ break;
+ case '\t':
+ break;
+ }
+ putchar(c);
+ }
+}
+
+doulg()
+{
+ register char *lp, *gp;
+ char *maxgp;
+ register c;
+ char csw;
+ int col;
+
+ gp = genbuf;
+ *gp = 0;
+ maxgp = gp;
+ col = 0;
+ for (lp = linebuf; c = *lp++;) {
+ switch (c) {
+ case '\t':
+ while ((col & 7) != 7) {
+ *gp++ = ' ';
+ if (gp >= &genbuf[BUFSIZ - 2])
+ goto ovflo;
+ col++;
+ }
+ break;
+ default:
+ if (gp >= maxgp)
+ break;
+ c |= (*gp & QUOTE);
+ break;
+ case '_':
+ if (gp >= maxgp)
+ c = QUOTE;
+ else
+ c = *gp | QUOTE;
+ break;
+ case '\b':
+ if (gp > genbuf) {
+ gp--;
+ col--;
+ }
+ continue;
+ }
+ if (gp >= &genbuf[BUFSIZ - 2]) {
+ovflo:
+ fprintf(stderr, "Line too long\n");
+ exit(1);
+ }
+ *gp++ = c;
+ if (gp > maxgp)
+ maxgp = gp;
+ col++;
+ }
+ *maxgp = 0;
+ strcpy(linebuf, genbuf);
+ for (lp = linebuf, gp = genbuf; c = *lp; gp++, lp++)
+ if (c & QUOTE) {
+ c &= 0177;
+ if (c == 0)
+ *lp = '_', *gp = ' ';
+ else
+ *lp = c, *gp = '-';
+ } else
+ *gp = ' ';
+ --gp;
+ while (gp >= genbuf && *gp == ' ')
+ --gp;
+ gp[1] = 0;
+}
projects / unix-history / commitdiff