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#define _POSIX_C_SOURCE 2
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <ctype.h>
#include <stdint.h>
bool isodigit(char c)
{
return c >= '0' && c < '8';
}
int main(int argc, char **argv)
{
int option;
bool escape = false;
bool newline = true;
while ((option = getopt(argc, argv, "neE")) != -1)
{
switch (option)
{
case 'e': escape = true; break;
case 'E': escape = false; break;
case 'n': newline = false; break;
}
}
for (; optind < argc; optind++)
{
char *str = argv[optind];
if (escape)
{
for (size_t i = 0; str[i] != '\0'; i++)
{
if (str[i] == '\\')
{
uint8_t c = 0;
int shift = 1;
switch (str[i + 1])
{
case '\\': c = '\\'; break;
case 'a': c = '\a'; break;
case 'b': c = '\b'; break;
case 'e': c = '\033'; break;
case 'f': c = '\f'; break;
case 'n': c = '\n'; break;
case 'r': c = '\r'; break;
case 't': c = '\t'; break;
case 'v': c = '\v'; break;
case '0':
c = 0;
for (int j = 0; isodigit(str[i + 2 + j]) && j < 3; j++)
{
c *= 8;
c += str[i + 2 + j] - '0';
shift++;
}
break;
case 'x':
c = 0;
for (int j = 0; isxdigit(str[i + 2 + j]) && j < 2; j++)
{
c *= 16;
if (islower(str[i + 2 + j]))
c += 10 + str[i + 2 + j] - 'a';
else if (isupper(str[i + 2 + j]))
c += 10 + str[i + 2 + j] - 'A';
else
c += str[i + 2 + j] - '0';
shift++;
}
break;
case 'c':
str[i] = '\0';
fputs(str, stdout);
fflush(stdout);
exit(EXIT_SUCCESS);
break;
default:
shift = -1;
break;
}
if (shift != -1)
{
str[i] = c;
memmove(&str[i + 1], &str[i + 1 + shift], strlen(&str[i + 1 + shift]) + 1);
}
}
}
}
fputs(str, stdout);
if (optind + 1 != argc)
putchar(' ');
}
if (newline)
putchar('\n');
return EXIT_SUCCESS;
}
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