projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 8f85bfee RC |
1 | /* lpf.c 4.5 83/02/10 |
| 2 | * filter which reads the output of nroff and converts lines | |
| 3 | * with ^H's to overwritten lines. Thus this works like 'ul' | |
| 4 | * but is much better: it can handle more than 2 overwrites | |
| 5 | * and it is written with some style. | |
| 6 | * modified by kls to use register references instead of arrays | |
| 7 | * to try to gain a little speed. | |
| 3f5fc8d0 | 8 | */ |
| 3f5fc8d0 BJ |
9 | #include <stdio.h> |
| 10 | #include <signal.h> | |
| 11 | ||
| 8f85bfee RC |
12 | #define MAXWIDTH 132 |
| 13 | #define MAXREP 10 | |
| 3f5fc8d0 | 14 | |
| 8f85bfee RC |
15 | char buf[MAXREP][MAXWIDTH]; |
| 16 | int maxcol[MAXREP] = {-1}; | |
| 3f5fc8d0 BJ |
17 | |
| 18 | main() | |
| 19 | { | |
| 8f85bfee RC |
20 | register FILE *p = stdin, *o = stdout; |
| 21 | register int i, col; | |
| 22 | register char *cp; | |
| 23 | int done, linedone, maxrep; | |
| 24 | char ch, *limit; | |
| 25 | ||
| 26 | for (cp = buf[0], limit = buf[MAXREP]; cp < limit; *cp++ = ' '); | |
| 27 | done = 0; | |
| 28 | ||
| 29 | while (!done) { | |
| 30 | col = 0; | |
| 31 | maxrep = 0; | |
| 32 | linedone = 0; | |
| 33 | while (!linedone) { | |
| 34 | switch (ch = getc(p)) { | |
| 35 | case EOF: | |
| 36 | linedone = done = 1; | |
| 37 | ch = '\n'; | |
| 38 | break; | |
| 39 | ||
| 40 | case '\031': | |
| 41 | fflush(stdout); | |
| 42 | kill(getpid(), SIGSTOP); | |
| 43 | break; | |
| 44 | ||
| 45 | case '\f': | |
| 46 | case '\n': | |
| 47 | linedone = 1; | |
| 48 | break; | |
| 49 | ||
| 50 | case '\b': | |
| 51 | if (col-- < 0) | |
| 52 | col = 0; | |
| 53 | break; | |
| 54 | ||
| 55 | case '\r': | |
| 56 | col = 0; | |
| 57 | break; | |
| 58 | ||
| 59 | case '\t': | |
| 60 | col = (col | 07) + 1; | |
| 61 | break; | |
| 62 | ||
| 63 | default: | |
| 64 | if (col >= MAXWIDTH) | |
| 65 | break; | |
| 66 | cp = &buf[0][col]; | |
| 67 | for (i = 0; i < MAXREP; i++) { | |
| 68 | if (i > maxrep) | |
| 69 | maxrep = i; | |
| 70 | if (*cp == ' ') { | |
| 71 | *cp = ch; | |
| 72 | if (col > maxcol[i]) | |
| 73 | maxcol[i] = col; | |
| 74 | break; | |
| 75 | } | |
| 76 | cp += MAXWIDTH; | |
| 77 | } | |
| 78 | col++; | |
| 79 | break; | |
| 3f5fc8d0 BJ |
80 | } |
| 81 | } | |
| 3f5fc8d0 | 82 | |
| 8f85bfee RC |
83 | /* print out lines */ |
| 84 | for (i = 0; i <= maxrep; i++) { | |
| 85 | for (cp = buf[i], limit = cp+maxcol[i]; cp <= limit;) { | |
| 86 | putc(*cp, o); | |
| 87 | *cp++ = ' '; | |
| 88 | } | |
| 89 | if (i < maxrep) | |
| 90 | putc('\r', o); | |
| 91 | else | |
| 92 | putc(ch, o); | |
| 93 | maxcol[i] = -1; | |
| fdaeefb7 | 94 | } |
| 3f5fc8d0 | 95 | } |
| 3f5fc8d0 | 96 | } |