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/* ISC license. */
#include <stdint.h>
#include <string.h>
#include <skalibs/types.h>
#include <skalibs/buffer.h>
#include <skalibs/strerr2.h>
#include <skalibs/env.h>
#include <skalibs/stralloc.h>
#include <skalibs/djbunix.h>
#define USAGE "envfile file prog..."
#define dieusage() strerr_dieusage(100, USAGE)
#define dienomem() strerr_diefu1sys(111, "stralloc_catb")
static inline uint8_t cclass (char c)
{
switch (c)
{
case 0 : return 0 ;
case '#' : return 1 ;
case '\n' : return 2 ;
case '=' : return 3 ;
case ' ' :
case '\t' :
case '\f' :
case '\r' : return 4 ;
default : return 5 ;
}
}
static inline char next (char const *file, buffer *b)
{
char c ;
ssize_t r = buffer_get(b, &c, 1) ;
if (r < 0) strerr_diefu2sys(111, "read from ", file) ;
if (!r) c = 0 ;
return c ;
}
static inline void parse_config (char const *file, buffer *b, stralloc *modif)
{
static uint8_t const table[7][6] =
{
{ 0x07, 0x01, 0x80, 0x08, 0x00, 0x22 },
{ 0x07, 0x01, 0x80, 0x01, 0x01, 0x01 },
{ 0x08, 0x08, 0x08, 0x24, 0x03, 0x22 },
{ 0x08, 0x08, 0x08, 0x24, 0x03, 0x08 },
{ 0x47, 0x41, 0xc0, 0x25, 0x04, 0x25 },
{ 0x47, 0x41, 0xc0, 0x25, 0x46, 0x25 },
{ 0x07, 0x01, 0x80, 0x08, 0x06, 0x08 }
} ;
unsigned int line = 1 ;
uint8_t state = 0 ;
while (state < 7)
{
char c = next(file, b) ;
uint8_t what = table[state][cclass(c)] ;
state = what & 0x0f ;
if (what & 0x20)
if (!stralloc_catb(modif, &c, 1)) dienomem() ;
if (what & 0x40)
if (!stralloc_0(modif)) dienomem() ;
if (what & 0x80) line++ ;
}
if (state > 7)
{
char fmt[UINT_FMT] ;
fmt[uint_fmt(fmt, line)] = 0 ;
strerr_dief4x(1, "syntax error line ", fmt, " while parsing ", file) ;
}
}
int main (int argc, char const *const *argv, char const *const *envp)
{
stralloc modif = STRALLOC_ZERO ;
PROG = "envfile" ;
if (argc < 3) dieusage() ;
if (!strcmp(argv[1], "-"))
parse_config("standard input", buffer_0, &modif) ;
else
{
buffer b ;
char buf[BUFFER_INSIZE] ;
int fd = open_readb(argv[1]) ;
if (fd == -1) strerr_diefu2sys(111, "open ", argv[1]) ;
buffer_init(&b, &buffer_read, fd, buf, BUFFER_INSIZE) ;
parse_config(argv[1], &b, &modif) ;
fd_close(fd) ;
}
xpathexec_r(argv + 2, envp, env_len(envp), modif.s, modif.len) ;
}
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