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#define _POSIX_C_SOURCE 200809L
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdbool.h>
#include <string.h>
#include <strings.h>
#include <errno.h>
static char *g_name = "uniq";
void fatal(const char *format, ...)
{
va_list ap;
va_start(ap, format);
fprintf(stderr, "%s: ", g_name);
vfprintf(stderr, format, ap);
fputc('\n', stderr);
va_end(ap);
exit(EXIT_FAILURE);
}
char *xstrdup(const char *s)
{
char *ret = strdup(s);
if (ret == NULL)
fatal("%s", strerror(errno));
return ret;
}
long parse_ulong(char *str, char *error_msg)
{
char *end;
long ret;
errno = 0;
ret = strtol(str, &end, 10);
if (errno != 0 || ret < 0 || *end != '\0')
fatal("%s: %s", optarg, error_msg);
return ret;
}
enum flags
{
FLAG_COUNT = 1 << 0,
FLAG_REPEATED = 1 << 1,
FLAG_REPEATED_ALL = 1 << 2,
FLAG_IGNORE_CASE = 1 << 3,
FLAG_UNIQUE_ONLY = 1 << 4,
};
bool line_equal(char *line1, char *line2, enum flags flags)
{
if (flags & FLAG_IGNORE_CASE)
return (strcasecmp(line1, line2) == 0);
return (strcmp(line1, line2) == 0);
}
void line_print(char *line, enum flags flags, FILE *output, int counter)
{
if (flags & FLAG_COUNT)
fprintf(output, "%7u ", counter);
fputs(line, output);
}
int main(int argc, char **argv)
{
int option;
enum flags flags = 0;
long skip_fields = -1;
long skip_chars = -1;
long width = -1;
char delimiter = '\n';
while ((option = getopt(argc, argv, "cdDf:is:uzw:")) != -1)
{
switch (option)
{
case 'c': flags |= FLAG_COUNT; break;
case 'd': flags |= FLAG_REPEATED; break;
case 'D': flags |= FLAG_REPEATED_ALL; break;
case 'i': flags |= FLAG_IGNORE_CASE; break;
case 'u': flags |= FLAG_UNIQUE_ONLY; break;
case 'z': delimiter = '\0'; break;
case 'f': skip_fields = parse_ulong(optarg, "invalid number of fields to skip"); break;
case 's': skip_chars = parse_ulong(optarg, "invalid number of bytes to skip"); break;
case 'w': width = parse_ulong(optarg, "invalid number of bytes to compare"); break;
}
}
FILE *input = stdin;
FILE *output = stdout;
if (argc - optind > 2)
fatal("extra operand '%s'", argv[optind + 2]);
if (optind < argc)
{
input = fopen(argv[optind], "r");
if (input == NULL)
fatal("%s: %s", argv[optind], strerror(errno));
if (optind + 1 < argc)
{
output = fopen(argv[optind + 1], "w");
if (output == NULL)
fatal("%s: %s", argv[optind + 1], strerror(errno));
}
}
char *line_prev = NULL;
char *line = NULL;
size_t line_size = 0;
size_t counter = 1;
if (getdelim(&line_prev, &line_size, delimiter, input) == -1)
return EXIT_SUCCESS;
while (getdelim(&line, &line_size, delimiter, input) != -1)
{
if (line_equal(line, line_prev, flags))
{
counter++;
}
else
{
line_print(line_prev, flags, output, counter);
counter = 1;
free(line_prev);
line_prev = xstrdup(line);
}
}
line_print(line_prev, flags, output, counter);
return EXIT_SUCCESS;
}
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