[unix-history] / usr / src / cmd / rev.c

#include <stdio.h>

/* reverse lines of a file */

#define N 256
char line[N];
FILE *input;

main(argc,argv)
char **argv;
{
	register i,c;
	input = stdin;
	do {
		if(argc>1) {
			if((input=fopen(argv[1],"r"))==NULL) {
				fprintf(stderr,"rev: cannot open %s\n",
					argv[1]);
				exit(1);
			}
		}
		for(;;){
			for(i=0;i<N;i++) {
				line[i] = c = getc(input);
				switch(c) {
				case EOF:
					goto eof;
				default:
					continue;
				case '\n':
					break;
				}
				break;
			}
			while(--i>=0)
				putc(line[i],stdout);
			putc('\n',stdout);
		}
eof:
		fclose(input);
		argc--;
		argv++;
	} while(argc>1);
}
Commit	Line	Data
3b600ead TL	1	#include <stdio.h>
	2
	3	/* reverse lines of a file */
	4
	5	#define N 256
	6	char line[N];
	7	FILE *input;
	8
	9	main(argc,argv)
	10	char **argv;
	11	{
	12	register i,c;
	13	input = stdin;
	14	do {
	15	if(argc>1) {
	16	if((input=fopen(argv[1],"r"))==NULL) {
	17	fprintf(stderr,"rev: cannot open %s\n",
	18	argv[1]);
	19	exit(1);
	20	}
	21	}
	22	for(;;){
	23	for(i=0;i<N;i++) {
	24	line[i] = c = getc(input);
	25	switch(c) {
	26	case EOF:
	27	goto eof;
	28	default:
	29	continue;
	30	case '\n':
	31	break;
	32	}
	33	break;
	34	}
	35	while(--i>=0)
	36	putc(line[i],stdout);
	37	putc('\n',stdout);
	38	}
	39	eof:
	40	fclose(input);
	41	argc--;
	42	argv++;
	43	} while(argc>1);
	44	}