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/* ISC license. */
#include <stdint.h>
#include <unistd.h>
#include <skalibs/buffer.h>
#include <skalibs/prog.h>
#include <skalibs/strerr.h>
#define USAGE "s6-frontend-helper-echore list"
/*
0 1 2
st\ev \0 \n other
0 ^p
START END START WORD
1 n n p
WORD END START WORD
^ 0x10 print ^
n 0x20 print /\n
p 0x40 print cur
*/
static inline uint8_t cclass (char c)
{
switch (c)
{
case '\0' : return 0 ;
case '\n' : return 1 ;
default : return 2 ;
}
}
static void do_print (char const *s)
{
static uint8_t const table[2][3] =
{
{ 0x02, 0x00, 0x51 },
{ 0x22, 0x20, 0x41 },
} ;
uint8_t state = 0 ;
while (state < 2)
{
char cur = *s++ ;
uint8_t c = table[state][cclass(cur)] ;
state = c & 0x03 ;
if (c & 0x10) if (buffer_put(buffer_1, "^", 1) < 1) strerr_diefusys(111, "write to stdout") ;
if (c & 0x20) if (buffer_put(buffer_1, "/\n", 2) < 2) strerr_diefusys(111, "write to stdout") ;
if (c & 0x40) if (buffer_put(buffer_1, &cur, 1) < 1) strerr_diefusys(111, "write to stdout") ;
}
}
int main (int argc, char const *const *argv)
{
PROG = "s6-frontend-helper-echore" ;
if (argc < 2) strerr_dieusage(100, USAGE) ;
do_print(argv[1]) ;
if (!buffer_flush(buffer_1)) strerr_diefusys(111, "write to stdout") ;
_exit(0) ;
}
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