GNO-Extras/v7/cmd/rev.c#b00008
Bobbi Webber-Manners 000d69c9ed Initial checkin
2020-01-28 23:22:35 -05:00

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#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);
}