jos/user/num.c

48 lines
667 B
C
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2018-10-24 17:44:45 -07:00
#include <inc/lib.h>
int bol = 1;
int line = 0;
void
num(int f, const char *s)
{
long n;
int r;
char c;
while ((n = read(f, &c, 1)) > 0) {
if (bol) {
printf("%5d ", ++line);
bol = 0;
}
if ((r = write(1, &c, 1)) != 1)
panic("write error copying %s: %e", s, r);
if (c == '\n')
bol = 1;
}
if (n < 0)
panic("error reading %s: %e", s, n);
}
void
umain(int argc, char **argv)
{
int f, i;
binaryname = "num";
if (argc == 1)
num(0, "<stdin>");
else
for (i = 1; i < argc; i++) {
f = open(argv[i], O_RDONLY);
if (f < 0)
panic("can't open %s: %e", argv[i], f);
else {
num(f, argv[i]);
close(f);
}
}
exit();
}