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/* See LICENSE file for copyright and license details. */
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define ULTIMATE_CODEPOINT 0x10FFFFUL
static const char *argv0;
static void parse_line(char *text, size_t lineno);
static int output(void);
static size_t
parse(char *buf, size_t len)
{
static int prev_was_cr = 0;
static size_t lineno = 1U;
size_t ret = 0;
size_t off = 0;
size_t she;
beginning:
if (prev_was_cr && off < len && buf[off] == '\n')
off++;
while (off < len && buf[off] != '\n' && buf[off] != '\r' && isspace(buf[off]))
off++;
ret = off;
if (off == len)
return ret;
if (buf[off] == '#') {
while (off < len && buf[off] != '\n' && buf[off] != '\r')
off++;
if (off == len)
return ret;
goto newline;
} else if (buf[off] == '\n' || buf[off] == '\r') {
newline:
prev_was_cr = buf[off] == '\r';
off++;
lineno++;
goto beginning;
}
for (; off < len; off++) {
if (buf[off] == '\0') {
fprintf(stderr, "%s: NUL byte found in <stdin> on line %zu\n", argv0, lineno);
exit(1);
} else if (buf[off] == '\n' || buf[off] == '\r' || buf[off] == '#') {
break;
}
}
if (off == len)
return ret;
if (buf[off] == '\n' || buf[off] == '\r') {
prev_was_cr = buf[off] == '\r';
buf[off++] = '\0';
} else if (buf[off] == '#') {
she = off++;
while (off < len && buf[off] != '\n' && buf[off] != '\r')
off++;
if (off == len)
return ret;
buf[she] = '\0';
prev_was_cr = buf[off++] == '\r';
} else {
abort();
}
parse_line(&buf[ret], lineno);
lineno++;
goto beginning;
}
int
main(int argc, char *argv[])
{
char *buf = NULL;
size_t bufsize = 0;
size_t len = 0;
size_t parsed;
ssize_t r;
argv0 = argv[0];
(void) argc;
for (;;) {
if (len == bufsize) {
buf = realloc(buf, bufsize += 8192U);
if (!buf) {
fprintf(stderr, "%s: realloc %zu: %s\n", argv0, bufsize, strerror(errno));
exit(1);
}
}
r = read(STDIN_FILENO, &buf[len], bufsize - len);
if (r <= 0) {
if (!r)
break;
if (errno == EINTR)
continue;
fprintf(stderr, "%s: read <stdin>: %s\n", argv0, strerror(errno));
exit(1);
}
len += (size_t)r;
parsed = parse(buf, len);
memmove(&buf[0], &buf[parsed], len -= parsed);
}
buf[len++] = '\n';
parse(buf, len);
free(buf);
if (output() < 0 || fflush(stdout)) {
fprintf(stderr, "%s: failed to write to <stdout>\n", argv0);
exit(1);
}
return 0;
}
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