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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdbool.h>
#include <limits.h>
#include "intmath.h"
#include "formatting.h"
#include "config-parser.h"
int tests_run = 0;
int tests_failed = 0;
int main (int argc, char* argv[]) {
Result res = parse_config(argc, argv);
if (res.success == false) {
char* err_msg = (char*) res.result;
fprintf(
stderr,
"Error parsing command line: %s.\nTry `stdu --help` for more info.\n",
err_msg
);
return 1;
}
Config* conf = (Config*) res.result;
FILE* progress_destination = conf->forward ? stderr : stdout;
if (conf->help) {
printf(
"Usage: stdu [-hm?] [-p n]\n\
Print amount of data piped to stdin.\n\
--help | -?: print this help message\n\
--human-readable | -h: output in a human readable format\n\
--multiline | -m: output with line breaks\n\
--forward | -o: forward STDIN to STDOUT and print amount of transferred data to STDERR\n\
--precision n | -p n | -pn: output with n significant digits\n"
);
return 0;
}
unsigned int base = 10;
if (conf->human_readable && conf->precision == 0) {
conf->precision = 1;
base = 1024;
}
char* endl = "";
if (conf->multiline) {
endl = "\n";
}
int blocksize = 1;
size_t bufsize = 1;
int bufsize_tries = 10;
unsigned long long bytes_read = 0;
size_t new_read_bytes = 0;
if (conf->precision != 0) {
int max_precision = int_logn(base, (unsigned int) INT_MAX);
if (conf->precision > max_precision) {
fprintf(
stderr,
"Overflow error: precision may not be greater than %d\n",
max_precision
);
return 1;
}
blocksize = exp_notated_to_ull(ull_ceiled_exponent_notation_base(
bytes_read + 1,
conf->precision,
base))
- bytes_read;
bufsize = 1024;
}
char* buf = malloc(bufsize);
char* tmpbuf;
size_t stdout_buffer_size = 16;
char* stdout_buffer = malloc(stdout_buffer_size);
int previous_line_strlen = 0;
while (1) {
/* output to the user */
if (conf->human_readable && base == 10) {
int res = ull_floored_with_prefix(
&stdout_buffer,
&stdout_buffer_size,
bytes_read,
conf->precision
);
if (res < 0) {
fprintf(
progress_destination,
"\r%llu \
(error when getting prefix)%s",
bytes_read,
endl
);
continue;
}
fprintf(
progress_destination,
"\r%sB%*s",
stdout_buffer,
int_max(previous_line_strlen - res, 0),
endl
);
previous_line_strlen
= int_max(res, previous_line_strlen);
} else if (conf->human_readable && base == 1024) {
int res = ull_floored_with_binary_prefix(
&stdout_buffer,
&stdout_buffer_size,
bytes_read
);
if (res < 0) {
fprintf(
progress_destination,
"\r%llu \
(error when getting prefix)%s",
bytes_read,
endl
);
}
fprintf(
progress_destination,
"\r%sB%*s",
stdout_buffer,
int_max(previous_line_strlen - res, 0),
endl
);
previous_line_strlen
= int_max(res, previous_line_strlen);
} else {
fprintf(
progress_destination,
"\r%llu%s",
bytes_read,
endl
);
}
if (fflush(progress_destination) == EOF) {
printf("\n");
perror("error during fflush");
return 1;
}
/* reading */
new_read_bytes = fread(
buf,
1,
int_min(blocksize, bufsize)/* + (blocksize == 0)*/,
stdin
);
if (new_read_bytes == 0) {
int err = ferror(stdin);
if (err != 0) {
printf("\n");
fprintf(stderr, "error reading stdin");
return err;
}
break;
}
bytes_read += new_read_bytes;
/* writing forwarded data */
if (conf->forward) {
fwrite(buf, 1, new_read_bytes, stdout);
}
/* resizing buffer and blocksize to read as much as possible
* at once
*/
if (bufsize_tries <= 0) continue;
if (conf->precision == 0) continue;
blocksize = exp_notated_to_ull(
ull_ceiled_exponent_notation_base(
bytes_read + 1,
conf->precision,
base
)
) - bytes_read;
if (blocksize > bufsize) {
tmpbuf = malloc(bufsize * 2);
if (tmpbuf == NULL) {
bufsize_tries--;
free(tmpbuf);
} else {
free(buf);
buf = tmpbuf;
bufsize *= 2;
}
}
}
fprintf(progress_destination, "\n");
free(stdout_buffer);
return 0;
}
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