136 lines
2.3 KiB
C
136 lines
2.3 KiB
C
/* prep - prepare file for statistics Author: Andy Tanenbaum */
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#include <ctype.h>
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#include <stdlib.h>
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#include <stdio.h>
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#define TROFF_CHAR '.' /* troff commands begin with this char */
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#define EOL '\n' /* end of line char */
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#define APOSTROPHE 047 /* single quote */
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#define BACKSLASH '\\' /* troff code */
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int lfread; /* set when last char read was lf */
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int lfwritten = 1; /* set when last char written was lf */
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int main(int argc, char **argv);
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void skipline(void);
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int backslash(void);
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void usage(void);
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int main(argc, argv)
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int argc;
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char *argv[];
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{
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int c;
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if (argc > 2) usage();
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if (argc == 2) {
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if (freopen(argv[1], "r", stdin) == NULL) {
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printf("prep: cannot open %s\n", argv[1]);
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exit(1);
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}
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}
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while ((c = getchar()) != EOF) {
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/* Lines beginning with "." are troff commands -- skip them. */
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if (lfread && c == TROFF_CHAR) {
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skipline();
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continue;
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}
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while (c == BACKSLASH) c = backslash(); /* eat troff stuff */
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if (isupper(c)) {
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putchar(tolower(c));
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lfwritten = 0;
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lfread = 0;
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continue;
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}
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if (islower(c)) {
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putchar(c);
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lfwritten = 0;
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lfread = 0;
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continue;
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}
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if (c == APOSTROPHE) {
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putchar(c);
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lfwritten = 0;
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lfread = 0;
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continue;
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}
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lfread = (c == EOL ? 1 : 0);
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if (lfwritten) continue;
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putchar(EOL);
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lfwritten = 1;
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}
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return(0);
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}
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void skipline()
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{
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char c;
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while ((c = getchar()) != EOL);
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}
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int backslash()
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{
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/* A backslash has been seen. Eat troff stuff. */
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int c, c1, c2;
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c = getchar();
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switch (c) {
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case 'f':
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c = getchar();
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c = getchar();
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return(c);
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case 's': /* \s7 or \s14 */
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c = getchar();
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c = getchar();
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if (isdigit(c)) c = getchar();
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return(c);
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case 'n': /* \na or \n(xx */
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c = getchar();
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if (c == '(') {
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c = getchar();
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c = getchar();
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}
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c = getchar();
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return(c);
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case '*': /* / * (XX */
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c = getchar();
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if (c == '(') {
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c = getchar();
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c = getchar();
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c = getchar();
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return(c);
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}
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case '(': /* troff 4-character escape sequence */
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c1 = getchar();
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c2 = getchar();
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if (c1 == 'e' && c2 == 'm') return(' ');
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if (c1 == 'e' && c2 == 'n') return(' ');
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c = getchar();
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return(c);
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case '%': /* soft hyphen: \% */
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c = getchar();
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return(c);
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default:
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return(c);
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}
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}
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void usage()
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{
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printf("Usage: prep [file]\n");
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exit(1);
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}
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