1 /* prep - prepare file for statistics Author: Andy Tanenbaum */ 2 3 #include <ctype.h> 4 #include <stdlib.h> 5 #include <stdio.h> 6 7 #define TROFF_CHAR '.' /* troff commands begin with this char */ 8 #define EOL '\n' /* end of line char */ 9 #define APOSTROPHE 047 /* single quote */ 10 #define BACKSLASH '\\' /* troff code */ 11 12 int lfread; /* set when last char read was lf */ 13 int lfwritten = 1; /* set when last char written was lf */ 14 15 int main(int argc, char **argv); 16 void skipline(void); 17 int backslash(void); 18 void usage(void); 19 20 int main(argc, argv) 21 int argc; 22 char *argv[]; 23 { 24 25 int c; 26 27 if (argc > 2) usage(); 28 if (argc == 2) { 29 if (freopen(argv[1], "r", stdin) == NULL) { 30 printf("prep: cannot open %s\n", argv[1]); 31 exit(1); 32 } 33 } 34 while ((c = getchar()) != EOF) { 35 /* Lines beginning with "." are troff commands -- skip them. */ 36 if (lfread && c == TROFF_CHAR) { 37 skipline(); 38 continue; 39 } 40 while (c == BACKSLASH) c = backslash(); /* eat troff stuff */ 41 42 if (isupper(c)) { 43 putchar(tolower(c)); 44 lfwritten = 0; 45 lfread = 0; 46 continue; 47 } 48 if (islower(c)) { 49 putchar(c); 50 lfwritten = 0; 51 lfread = 0; 52 continue; 53 } 54 if (c == APOSTROPHE) { 55 putchar(c); 56 lfwritten = 0; 57 lfread = 0; 58 continue; 59 } 60 lfread = (c == EOL ? 1 : 0); 61 if (lfwritten) continue; 62 putchar(EOL); 63 lfwritten = 1; 64 } 65 return(0); 66 } 67 68 69 void skipline() 70 { 71 char c; 72 73 while ((c = getchar()) != EOL); 74 } 75 76 77 int backslash() 78 { 79 /* A backslash has been seen. Eat troff stuff. */ 80 81 int c, c1, c2; 82 83 c = getchar(); 84 switch (c) { 85 case 'f': 86 c = getchar(); 87 c = getchar(); 88 return(c); 89 90 case 's': /* \s7 or \s14 */ 91 c = getchar(); 92 c = getchar(); 93 if (isdigit(c)) c = getchar(); 94 return(c); 95 96 case 'n': /* \na or \n(xx */ 97 c = getchar(); 98 if (c == '(') { 99 c = getchar(); 100 c = getchar(); 101 } 102 c = getchar(); 103 return(c); 104 105 case '*': /* / * (XX */ 106 c = getchar(); 107 if (c == '(') { 108 c = getchar(); 109 c = getchar(); 110 c = getchar(); 111 return(c); 112 } 113 114 case '(': /* troff 4-character escape sequence */ 115 c1 = getchar(); 116 c2 = getchar(); 117 if (c1 == 'e' && c2 == 'm') return(' '); 118 if (c1 == 'e' && c2 == 'n') return(' '); 119 c = getchar(); 120 return(c); 121 122 case '%': /* soft hyphen: \% */ 123 c = getchar(); 124 return(c); 125 126 default: 127 return(c); 128 129 } 130 } 131 132 void usage() 133 { 134 printf("Usage: prep [file]\n"); 135 exit(1); 136 } 137