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*/
#include <ctype.h>
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <stdlib.h>
/*
** ============
** DECLARATIONS
** ============
*/
/*!
** Retreive command line option
**
** @param argv argument vector
** @param argp argument position
** @param line line flag
** @param ext extended flag
*/
static void getoption(char *argv[], int *argp, int *line, int *ext);
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** @param msg
**
** @return if return 0, builtin must quit immediatly, else ok.
*/
static int builtin_echo_ext(const char *msg);
/*!
** Print hexa number on stdout a number
**
** @param msg message to print
** @param base base of the number
*/
static void print_hex(const char **);
/*!
** Print oct number on stdout a number
**
** @param msg message to print
** @param base base of the number
*/
static void print_oct(const char **);
/*!
** Function to say if c is a digit or not.
** It use macro isdigit, but due to epita coding style
** restriction about cast, it's impossible to call
** a macro wrote with int with char, because cast is forbidden
** and macro call, dont have the same right about parameter
** implicit cast (on netBSD)
**
** @param c character
**
** @return if \param c is a digit
*/
static int fisdigit(const int c);
/*!
** Function to say if c is a digit or not.
** It use macro isdigit, but due to epita coding style
** restriction about cast, it's impossible to call
** a macro wrote with int with char, because cast is forbidden
** and macro call, dont have the same right about parameter
** implicit cast (on netBSD)
**
** @param c character
**
** @return if \param c is a hexa digit
*/
static int fisxdigit(const int c);
/*
** ===========
** DEFINITIONS
** ===========
{
int argp;
int ext = 0;
int line = 1;
int first;
assert(argv && argv[0]);
ext = option_is_set(shell->option, "xpg_echo");
for (getoption(argv, &argp, &line, &ext), first = argp; argv[argp]; ++argp) {
if (ext && !builtin_echo_ext(argv[argp]))
return fflush(stdout);
printf("%s", argv[argp]);
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}
if (line)
printf("\n");
return fflush(stdout);
}
static void getoption(char *argv[], int *argp, int *line, int *ext)
{
char *carg;
for (*argp = 1; (carg = argv[*argp]); ++*argp)
if (*carg == '-')
for (++carg; *carg; ++carg)
if (*carg == 'e')
*ext = 1;
else if (*carg == 'E')
*ext = 0;
else if (*carg == 'n')
*line = 0;
else
return;
else
return;
}
static int builtin_echo_ext(const char *msg)
{
int backed = 0;
for (; *msg; ++msg)
if (*msg == '\\' && !backed && (backed = 1))
continue;
else if (backed && *msg == 'a' && !(backed = 0))
putchar('\a');
else if (backed && *msg == 'b' && !(backed = 0))
putchar('\b');
else if (backed && *msg == 'c')
return 0;
else if (backed && *msg == 'e' && !(backed = 0))
putchar(0x1b);
else if (backed && *msg == 'f' && !(backed = 0))
putchar('\f');
else if (backed && *msg == 'n' && !(backed = 0))
putchar('\n');
else if (backed && *msg == 'r' && !(backed = 0))
putchar('\r');
else if (backed && *msg == 't' && !(backed = 0))
putchar('\t');
else if (backed && *msg == '\\' && !(backed = 0))
putchar('\\');
else if (backed && *msg == 'v' && !(backed = 0))
putchar('\v');
else if (backed && fisdigit(*msg) && !(backed = 0))
print_oct(&msg);
else if (backed && *msg == 'x' && !(backed = 0) && (++msg))
print_hex(&msg);
else if (backed && !(backed = 0))
printf("\\%c", *msg);
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return 1;
}
static void print_hex(const char **msg)
{
char buf[4];
char *end;
long n;
unsigned char c;
int i;
if (!fisxdigit(**msg))
return;
for (i = 0; fisxdigit(**msg) && i < 2; ++*msg, ++i)
buf[i] = **msg;
buf[i] = 0;
--*msg;
n = strtoul(buf, &end, 16);
printf("%c", (c = n));
}
static void print_oct(const char **msg)
{
char buf[5];
char *end;
unsigned long n;
unsigned char c;
int i;
int max;
if (!isoctale(**msg))
return;
max = (**msg == '0') ? 4 : 3;
for (i = 0; isoctale(**msg) && i < max; ++*msg, ++i)
buf[i] = **msg;
buf[i] = 0;
--*msg;
n = strtoul(buf, &end, 8);
printf("%c", (c = n));
}
static int fisdigit(const int c)
{
return isdigit(c);
}
static int fisxdigit(const int c)
{
return isxdigit(c);
}