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/* serdo.c
modified by Nikola Vladov
unset VAR
exit n
exec file
# comment
ps -ax # comment ps
long line \
continues here
echo something
. file
VAR=val ... command ...
killall5 -signumber
*/
#include <unistd.h>
#include <fcntl.h>
#include <ctype.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <time.h>
#include "../ninitfeatures.h"
#include "../error_table.h"
struct cmd {
char *pos;
char *x;
char last;
char eof;
};
static unsigned int env_free, last_cmd;
static char continueonerror;
static int batch(char *s);
#include "put_env.h"
static char *e() { return error_string(table, errno); }
#define str_equal(A,B) !str_diff(A,B)
#define byte_equal(A,l,B) !byte_diff(A,l,B)
#define is_space(c) *c==' ' || (unsigned int)(char)(*c - 9)<5
#define carpsys(...) err(2,__VA_ARGS__,": ",e(),(char*)0)
#define diesys(n,...) do { err(2,__VA_ARGS__,": ",e(),(char*)0); _exit(n); } while(0)
#define DQUOTE '"'
#define SQUOTE '\''
static void pr_argv(int fd, char **argv) {
char *s;
while ((s=*argv++)) {
unsigned int len = str_len(s);
if (*argv) s[len++] = ' ';
errmsg_put(fd,s,len);
}
errmsg_puts(fd,"\n");
errmsg_puts(fd,0);
}
static int pr_fail(char **argv) {
carpsys(argv[0]);
if (argv[1]) pr_argv(2, argv);
return -1;
}
static void put__env(char *s) { if (put_env(s)) die(1, "Out of memory"); }
static int spawn(char **argv) {
int i;
char *s0=argv[0], *s1=argv[1], cfg_exec=0, ignore=0;
if (str_equal(s0,"cd")) {
if (chdir(s1)) return pr_fail(argv);
return 0;
} else if (str_equal(s0,"export") || str_equal(s0,"unset")) {
while (*++argv) put__env(*argv);
return 0;
#ifdef SERDO_WANT_echo
} else if (str_equal(s0,"echo")) {
pr_argv(1, argv+1);
return 0;
#endif
} else if (s1) {
i = x_atoi(s1);
if (str_equal(s0,"exit")) { _exit(i); }
else if (str_equal(s0,"exec")) { cfg_exec++; ++argv; }
else if (s0[0]=='.' && s0[1]==0) { return batch(s1); }
#ifdef SERDO_WANT_killall5
else if (str_equal(s0,"killall5")) { return kill(-1,-i); }
#endif
}
if (argv[0][0] == '-') { argv[0] += 1; ignore = 1; }
if (last_cmd && !cfg_exec) {
struct timespec ts = { 0, 500000000 };
while ((i=fork()) < 0) nanosleep(&ts, 0);
} else i=-1; /* don't fork */
if (i <= 0) {
#ifdef SERDO_WANT_environ_in_command
for (; argv[1]; put__env(*argv++)) {
s0 = argv[0];
if (!s0[str_chr(s0,'=')]) break;
}
#endif
pathexec_run(*argv,argv,environ);
pr_fail(argv);
if (!i) _exit(-1); /* child */
return (ignore) ? 0 : -1;
}
if (waitpid(i,&i,0)==-1) diesys(1,"waitpid failed");
if (ignore) return 0;
if (!WIFEXITED(i)) return -1;
return WEXITSTATUS(i);
}
static void get_word(struct cmd *c) {
char ch, *x, *s = c->pos;
while (is_space(s) || (*s=='\\' && s[1]=='\n')) ++s;
if (!*s) { c->eof |= 1; return; }
c->last=0;
c->x=x=s;
if (*x == '#') c->last |= 2;
while ((ch=*s)) {
if (ch==DQUOTE || ch==SQUOTE) {
while (*++s) { /* unterminated quoted string <==> *s == 0 */
if (*s != ch) *x++ = *s;
else {
if (s[-1] == '\\') x[-1] = ch;
else { s++; break; }
}
}
if (!*s) die(2, "syntax error: unexpected EOF");
}
else if (ch==' ' || ch=='\n' || ch=='\t') break;
else if (ch=='\\' && s[1]=='\n') { s += 2; continue; }
else if (ch=='#') { for (; *s && *s != '\n';) s++; break; }
else *x++ = *s++;
}
while (*s==' ' || *s=='\t') ++s;
if (*s=='\n') { ++s; c->last |= 1; }
c->pos = s;
if (!*s) c->last |= 1;
*x = 0;
}
static char *get_argv0(struct cmd *c) {
while (1) {
get_word(c);
if (c->eof) break;
if (c->last & 2) continue;
return c->x;
}
return 0;
}
static int get_argv(struct cmd *c) {
unsigned int k=0, len=16;
char **argv, first=0;
argv = alloca((len+2)*sizeof(char*));
do {
if (first) get_word(c);
else first |= 1;
if (c->eof) break;
if (c->last < 2) { /* comment */
if (k >= len) {
char **tmp = argv;
len *= 2;
argv = alloca((len+2) * sizeof(char*));
byte_copy(argv, k*sizeof(char*), tmp);
}
argv[k++] = c->x;
}
} while (!c->last);
argv[k] = 0;
if (!get_argv0(c)) --last_cmd;
return spawn(argv);
}
static int execute(struct cmd *c) {
int r = 0;
if (get_argv0(c)) {
++last_cmd;
while (1) {
r = get_argv(c);
if (r!=0 && !continueonerror) break;
if (c->eof) break;
}
}
return r;
}
static int batch(char *s) {
struct cmd c;
int len, fd=open(s,O_RDONLY);
if (fd==-1 || GLOBAL_READ(fd,c.pos, len,32768)) {
carpsys("could not open ",s);
return 1;
}
close(fd);
c.pos[len] = 0;
c.eof = 0;
return execute(&c);
}
int main(int argc,char* argv[],char* env[]) {
if (argc<2) {
#ifdef SERDO_EXEC_script
if (!access("script",O_RDONLY)) *argv-- = "script"; else
#endif
{ ops: die(1,"usage: serdo [-c] file"); }
}
if (str_equal(argv[1],"-c")) {
++continueonerror;
++argv;
}
if (*++argv == 0) goto ops;
errmsg_iam("serdo");
for (env_free=0; env[env_free];) ++env_free;
++env_free;
environ = alloca((env_free + SERDO_MAX_NEW_ENVIRON) * sizeof(char *));
byte_copy(environ, env_free * sizeof(char *), env);
env_free = SERDO_MAX_NEW_ENVIRON;
return batch(*argv);
}
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