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ascii.c
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C/C++ Source or Header
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1990-07-23
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2KB
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93 lines
/* ascii - list lines with/without ASCII characters */
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#define BUFSIZE 4*1024
static char buf[BUFSIZE + 1]; /* input buffer - +1 for sentinel */
static char carry[BUFSIZE]; /* buffer for partial line carryover */
int main(argc, argv)
int argc;
char **argv;
{
int nflag = 0; /* 1 if invoked with -n */
int ascii_line; /* set to 1 if line is all ASCII */
int ascii_file = 1; /* set to 0 if file is not all ASCII */
int count; /* count of characters in buf */
char *start; /* points to beginning of line */
register char *end; /* points to end of line */
char *sentinel; /* points past last character in buffer */
int carry_count; /* size of carry over */
--argc;
++argv;
if (argc > 0 && strcmp(*argv, "-n") == 0) {
nflag = 1;
--argc;
++argv;
}
switch (argc) {
case 0:
break;
case 1:
close(0);
if (open(*argv, O_RDONLY) != 0) {
std_err("ascii: cannot open ");
std_err(*argv);
std_err("\n");
exit(1);
}
break;
default:
std_err("Usage: ascii [-n] file\n");
exit(1);
}
if ((count = read(0, buf, BUFSIZE)) <= 0) exit(0);
*(sentinel = &buf[count]) = '\n';
start = buf;
ascii_line = 1;
carry_count = 0;
while (1) {
for (end = start; *end != '\n'; ++end)
if ((*end & 0x80) != 0) {
ascii_line = 0;
ascii_file = 0;
end = (char *) memchr(end, '\n', BUFSIZE);
break;
}
if (end != sentinel) {
++end;
if (ascii_line != nflag) {
if (carry_count != 0)
fwrite(carry, carry_count, 1, stdout);
fwrite(start, (int)(end - start), 1, stdout);
}
carry_count = 0;
start = end;
ascii_line = 1;
} else {
if (carry_count != 0) {
std_err("ascii: line too long\n");
exit(1);
}
if (ascii_line != nflag) {
carry_count = end - start;
memcpy(carry, start, carry_count);
}
if ((count = read(0, buf, BUFSIZE)) <= 0) break;
*(sentinel = &buf[count]) = '\n';
start = buf;
}
}
if (ascii_line != nflag && carry_count != 0)
fwrite(carry, carry_count, 1, stdout);
exit(ascii_file == 0);
}