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#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <ctype.h>
#include <errmsg.h>
#include <sys/wait.h>
#include <str.h>
#include <byte.h>
#define MAXENV 256
char* envp[MAXENV+2];
int envc;
int continueonerror;
int envset(char* s) {
int i,l;
if (s[l=str_chr(s,'=')]!='=') return -1;
++l;
for (i=0; i<envc; ++i)
if (byte_equal(envp[i],l,s)) {
envp[i]=s;
return 0;
}
if (envc<MAXENV) {
envp[envc]=s;
envp[++envc]=0;
return 0;
}
return -1;
}
int spawn(char** argv, int last) {
int i;
if (str_equal(argv[0],"cd")) {
if (chdir(argv[1])==-1) {
carpsys("chdir failed");
return -1;
}
return 0;
} else if (str_equal(argv[0],"export")) {
for (i=1; argv[i]; ++i) envset(argv[i]);
return 0;
}
if (!last) {
if ((i=fork())==-1) diesys(1,"cannot fork");
} else i=0;
if (!i) {
/* child */
environ=envp;
_exit(execvp(argv[0],argv));
}
if (waitpid(i,&i,0)==-1) diesys(1,"waitpid failed");
if (!WIFEXITED(i))
return -1;
return WEXITSTATUS(i);
}
int run(char* s,int last) {
int i,spaces;
char** argv,**next;;
for (i=spaces=0; s[i]; ++i) if (s[i]==' ') ++spaces;
next=argv=alloca((spaces+1)*sizeof(char*));
while (*s) {
while (*s && isspace(*s)) ++s;
if (*s=='"') {
++s;
*next=s;
while (*s && s[-1] != '\\' && *s != '"') ++s;
if (!*s) {
--*next;
break;
}
*s=0;
++s;
} else if (*s=='\'') {
++s;
*next=s;
while (*s && s[-1] != '\\' && *s != '\'') ++s;
if (!*s) {
--*next;
break;
}
*s=0;
++s;
} else {
*next=s;
while (*s && *s!=' ' && *s!='\t') ++s;
if (!*s) break;
*s=0;
++s;
}
++next;
}
*++next=0;
return spawn(argv,last);
}
int execute(char* s) {
char* start;
int r;
r=0;
while (*s) {
int last;
while (isspace(*s)) ++s;
if (*s == '#') {
while (*s && *s != '\n') ++s;
continue;
}
start=s;
while (*s && *s != '\n') ++s;
if (*s) {
char* tmp;
*s=0;
++s;
for (tmp=s; *tmp; ++tmp)
if (!isspace(*tmp) && *tmp=='#') {
for (tmp=s+1; *tmp && *tmp!='\n'; ++tmp) ;
} else break;
last=(*tmp==0);
} else
last=1;
r=run(start,last);
if (r!=0 && !continueonerror)
break;
}
return r;
}
int batch(char* s) {
struct stat ss;
int fd=open(s,O_RDONLY);
char* map;
if (fd==-1) diesys(1,"could not open ",s);
if (fstat(fd,&ss)==-1) diesys(1,"could not stat ",s);
if (ss.st_size>32768) die(1,"file ",s," is too large");
map=alloca(ss.st_size+1);
if (read(fd,map,ss.st_size)!=(long)ss.st_size) diesys(1,"read error");
map[ss.st_size]=0;
close(fd);
return execute(map);
}
int main(int argc,char* argv[],char* env[]) {
int r;
(void)argc;
if (argc<2) die(1,"usage: serdo [-c] filename");
errmsg_iam("serdo");
for (envc=0; envc<MAXENV && env[envc]; ++envc) envp[envc]=env[envc];
envp[envc]=0;
if (str_equal(argv[1],"-c")) {
continueonerror=1;
++argv;
}
while (*++argv) {
if ((r=batch(*argv)))
return r;
}
return 0;
}
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