%PDF-
%PDF-
Mini Shell
Mini Shell
/* Generated by re2c */
// re2c $INPUT -o $OUTPUT -i
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#define YYMAXFILL 4
static int lex(const char *YYCURSOR) {
const char *YYMARKER, *n, *p, *u, *g, *f, *h, *c;
const char *yyt1;const char *yyt2;const char *yyt3;const char *yyt4;const char *yyt5;const char *yyt6;const char *yyt7;
for (;;) {
{
char yych;
yych = *YYCURSOR;
switch (yych) {
case 0x00: goto yy1;
case '\n':
case ':': goto yy4;
default:
yyt1 = YYCURSOR;
goto yy2;
}
yy1:
++YYCURSOR;
{ return 0; }
yy2:
yych = *(YYMARKER = ++YYCURSOR);
switch (yych) {
case 0x00:
case '\n': goto yy3;
default: goto yy6;
}
yy3:
{ fprintf(stderr, "error\n"); return 1; }
yy4:
++YYCURSOR;
goto yy3;
yy5:
yych = *++YYCURSOR;
yy6:
switch (yych) {
case 0x00:
case '\n': goto yy7;
case ':': goto yy8;
default: goto yy5;
}
yy7:
YYCURSOR = YYMARKER;
goto yy3;
yy8:
yych = *++YYCURSOR;
switch (yych) {
case 0x00:
case '\n': goto yy7;
case ':':
yyt2 = YYCURSOR;
goto yy10;
default:
yyt2 = YYCURSOR;
goto yy9;
}
yy9:
yych = *++YYCURSOR;
switch (yych) {
case 0x00:
case '\n': goto yy7;
case ':': goto yy10;
default: goto yy9;
}
yy10:
yych = *++YYCURSOR;
switch (yych) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
yyt3 = YYCURSOR;
goto yy11;
default: goto yy7;
}
yy11:
yych = *++YYCURSOR;
switch (yych) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9': goto yy11;
case ':': goto yy12;
default: goto yy7;
}
yy12:
yych = *++YYCURSOR;
switch (yych) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
yyt4 = YYCURSOR;
goto yy13;
default: goto yy7;
}
yy13:
yych = *++YYCURSOR;
switch (yych) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9': goto yy13;
case ':': goto yy14;
default: goto yy7;
}
yy14:
yych = *++YYCURSOR;
switch (yych) {
case 0x00:
case '\n': goto yy7;
case ':':
yyt5 = YYCURSOR;
goto yy16;
default:
yyt5 = YYCURSOR;
goto yy15;
}
yy15:
yych = *++YYCURSOR;
switch (yych) {
case 0x00:
case '\n': goto yy7;
case ':': goto yy16;
default: goto yy15;
}
yy16:
yych = *++YYCURSOR;
switch (yych) {
case '/':
yyt6 = YYCURSOR;
goto yy17;
default: goto yy7;
}
yy17:
yych = *++YYCURSOR;
switch (yych) {
case 0x00:
case '\n': goto yy7;
case ':': goto yy18;
default: goto yy17;
}
yy18:
yych = *++YYCURSOR;
switch (yych) {
case '/':
yyt7 = YYCURSOR;
goto yy19;
default: goto yy7;
}
yy19:
yych = *++YYCURSOR;
switch (yych) {
case 0x00:
case ':': goto yy7;
case '\n': goto yy20;
default: goto yy19;
}
yy20:
++YYCURSOR;
n = yyt1;
p = yyt2;
u = yyt3;
g = yyt4;
f = yyt5;
h = yyt6;
c = yyt7;
{
fprintf(stderr, "user: %.*s\n", (int)(p - n) - 1, n);
fprintf(stderr, "password: %.*s\n", (int)(u - p) - 1, p);
fprintf(stderr, "UID: %.*s\n", (int)(g - u) - 1, u);
fprintf(stderr, "GID: %.*s\n", (int)(f - g) - 1, g);
fprintf(stderr, "info: %.*s\n", (int)(h - f) - 1, f);
fprintf(stderr, "home: %.*s\n", (int)(c - h) - 1, h);
fprintf(stderr, "command: %.*s\n", (int)(YYCURSOR - c - 1), c);
fprintf(stderr, "\n");
continue;
}
}
}
}
int main() {
const char *fname = "etc_passwd";
FILE *f;
// prepare input file
f = fopen(fname, "w");
fprintf(f,
"root:x:0:0:root:/root:/bin/bash\n"
"bin:x:1:1:bin:/bin:/bin/false\n"
"portage:x:250:250:portage:/var/tmp/portage:/bin/false\n");
fclose(f);
// read input file into buffer
f = fopen(fname, "r");
fseek(f, 0, SEEK_END);
const size_t fsize = (size_t) ftell(f);
fseek(f, 0, SEEK_SET);
char *buffer = (char*) malloc(fsize + 1);
fread(buffer, 1, fsize, f);
buffer[fsize] = 0;
fclose(f);
assert(lex(buffer) == 0);
// cleanup
remove(fname);
free(buffer);
return 0;
}
Zerion Mini Shell 1.0