projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 2d473371 | 1 | /* lpf.c 4.3 81/06/02 */ |
| 3f5fc8d0 BJ |
2 | /* |
| 3 | * lpf -- Line printer filter: handles underlines for those printers/ | |
| 4 | * device drivers that won't | |
| 5 | */ | |
| 6 | ||
| 7 | #include <stdio.h> | |
| 8 | #include <signal.h> | |
| 9 | ||
| 10 | #define LINELN 132 | |
| 11 | ||
| 12 | char linebuf[LINELN+2]; | |
| 13 | int ov; | |
| 2d473371 | 14 | int ff; |
| 3f5fc8d0 BJ |
15 | char ovbuf[LINELN]; |
| 16 | ||
| 17 | main() | |
| 18 | { | |
| 19 | extern char _sobuf[BUFSIZ]; | |
| 20 | ||
| 21 | setbuf(stdout, _sobuf); | |
| 22 | while (getline()) | |
| 23 | putline(); | |
| 24 | fflush(stdout); | |
| 25 | if (ferror(stdout)) | |
| 26 | exit(1); | |
| 27 | exit(0); | |
| 28 | } | |
| 29 | ||
| 30 | getline() | |
| 31 | { | |
| 32 | register int col, maxcol, c; | |
| 33 | ||
| 34 | ov = 0; | |
| 35 | for (col=0; col<LINELN; col++) { | |
| 36 | linebuf[col] = ' '; | |
| 37 | ovbuf[col] = 0; | |
| 38 | } | |
| 39 | col = 0; | |
| 40 | maxcol = 0; | |
| 41 | for (;;) switch (c = getchar()) { | |
| 42 | ||
| 43 | case EOF: | |
| 44 | return(0); | |
| 45 | ||
| 46 | default: | |
| 47 | if (c>=' ') { | |
| 48 | if (col < LINELN) { | |
| 49 | if (linebuf[col]=='_') { | |
| 50 | ov++; | |
| 51 | ovbuf[col] = '_'; | |
| 52 | } | |
| 53 | linebuf[col++] = c; | |
| 54 | if (col > maxcol) | |
| 55 | maxcol = col; | |
| 56 | } | |
| 57 | } | |
| 58 | continue; | |
| 59 | ||
| 60 | case ' ': | |
| 61 | col++; | |
| 62 | continue; | |
| 63 | ||
| 64 | case '\t': | |
| 65 | col = (col|07) + 1; | |
| 66 | if (col>maxcol) | |
| 67 | maxcol = col; | |
| 68 | continue; | |
| 69 | ||
| 70 | case '\r': | |
| 71 | col = 0; | |
| 72 | continue; | |
| 73 | ||
| 74 | case '_': | |
| 75 | if (col>=LINELN) { | |
| 76 | col++; | |
| 77 | continue; | |
| 78 | } | |
| 79 | if (linebuf[col]!=' ') { | |
| 80 | ovbuf[col] = '_'; | |
| 81 | ov++; | |
| 82 | } else | |
| 83 | linebuf[col] = c; | |
| 84 | col++; | |
| 85 | if (col>maxcol) | |
| 86 | maxcol = col; | |
| 87 | continue; | |
| 88 | ||
| 2d473371 SL |
89 | case '\f': |
| 90 | ff = 1; /* force form feed */ | |
| 3f5fc8d0 BJ |
91 | case '\n': |
| 92 | if (maxcol>=LINELN) | |
| 93 | maxcol = LINELN; | |
| 94 | linebuf[maxcol] = 0; | |
| 95 | return(1); | |
| 96 | ||
| 97 | case '\b': | |
| 98 | if (col>0) | |
| 99 | col--; | |
| 100 | continue; | |
| 101 | } | |
| 102 | } | |
| 103 | ||
| 104 | putline() | |
| 105 | { | |
| 106 | register char *lp, *ep; | |
| 107 | register int c; | |
| 2d473371 | 108 | |
| 3f5fc8d0 BJ |
109 | lp = linebuf; |
| 110 | while (c = *lp++) | |
| 111 | output(c); | |
| 112 | if (ov) { | |
| 113 | putchar('\r'); | |
| 114 | for (ep= &ovbuf[LINELN-1]; *ep == 0; ep--) | |
| 115 | continue; | |
| 116 | for (lp=ovbuf; lp <= ep; lp++) | |
| 117 | output(*lp ? *lp : ' '); | |
| 118 | } | |
| 119 | putchar('\n'); | |
| 2d473371 SL |
120 | if (ff) { |
| 121 | ff = 0; | |
| 122 | putchar('\f'); | |
| 123 | } | |
| 3f5fc8d0 BJ |
124 | if (ferror(stdout)) |
| 125 | exit(1); | |
| 126 | } | |
| 127 | ||
| 128 | output(c) | |
| 129 | register char c; | |
| 130 | { | |
| 131 | ||
| 132 | if (c == -1) | |
| 133 | return; | |
| 134 | c &= 0177; | |
| 135 | if (c == 0177) | |
| 136 | putchar('^'), c = '?'; | |
| 137 | if (c == 033) | |
| 138 | c = '$'; | |
| 139 | if (c < ' ') switch (c) { | |
| 140 | ||
| 141 | case '\n': | |
| 142 | break; | |
| 143 | ||
| 144 | case '\f': | |
| 145 | case '\b': | |
| 146 | case '\t': | |
| 147 | case '\r': | |
| 148 | break; | |
| 149 | ||
| 150 | default: | |
| 151 | putchar('^'); | |
| 2d473371 | 152 | c |= 0100; |
| 3f5fc8d0 BJ |
153 | } |
| 154 | putchar(c); | |
| 155 | } |