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#include <unistd.h>
#include "buffer.h"
#include "logmsg.h"
#include "stralloc.h"
#include "open.h"
#include "case.h"
#include "cdbmake.h"
#include "logmsg.h"
#define WHO "setforward"
int rename(const char *,const char *); // stdio.h
void usage()
{
logmsg(WHO,100,USAGE,"setforward data.cdb data.tmp");
}
void nomem()
{
logmsg(WHO,111,FATAL,"out of memory");
}
void missingsemicolon()
{
logmsg(WHO,100,FATAL,"final instruction must end with semicolon");
}
void extracolon()
{
logmsg(WHO,100,FATAL,"double colons are not permitted");
}
void extracomma()
{
logmsg(WHO,100,FATAL,"commas are not permitted before colons");
}
void nulbyte()
{
logmsg(WHO,100,FATAL,"NUL bytes are not permitted");
}
void longaddress()
{
logmsg(WHO,100,FATAL,"addresses over 800 bytes are not permitted");
}
char *fncdb;
char *fntmp;
int fd;
struct cdb_make cdb;
stralloc key = {0};
stralloc target = {0}; /* always initialized; no NUL */
stralloc command = {0}; /* always initialized; no NUL */
stralloc instr = {0}; /* always initialized */
int flagtarget = 0;
/* 0: reading target; command is empty; instr is empty */
/* 1: target is complete; instr still has to be written; reading command */
void writeerr()
{
logmsg(WHO,111,FATAL,B("unable to write to: ",fntmp));
}
void doit(prepend,data,datalen)
char *prepend;
char *data;
int datalen;
{
if (!stralloc_copys(&key,prepend)) nomem();
if (!stralloc_cat(&key,&target)) nomem();
case_lowerb(key.s,key.len);
if (cdb_make_add(&cdb,key.s,key.len,data,datalen) == -1)
writeerr();
}
int getch(ch)
char *ch;
{
int r;
r = buffer_get(buffer_0small,ch,1);
if (r == -1)
logmsg(WHO,111,FATAL,"unable to read input: ");
return r;
}
int main(int argc, char **argv)
{
char ch;
if (!stralloc_copys(&target,"")) nomem();
if (!stralloc_copys(&command,"")) nomem();
if (!stralloc_copys(&instr,"")) nomem();
fncdb = argv[1]; if (!fncdb) usage();
fntmp = argv[2]; if (!fntmp) usage();
fd = open_trunc(fntmp);
if (fd == -1)
logmsg(WHO,111,FATAL,B("unable to create: ",fntmp));
if (cdb_make_start(&cdb,fd) == -1) writeerr();
for (;;) {
if (!getch(&ch)) goto EOF;
if (ch == '#') {
while (ch != '\n') if (!getch(&ch)) goto EOF;
continue;
}
if (ch == ' ') continue;
if (ch == '\n') continue;
if (ch == '\t') continue;
if (ch == ':') {
if (flagtarget) extracolon();
flagtarget = 1;
continue;
}
if ((ch == ',') || (ch == ';')) {
if (!flagtarget) extracomma();
if (command.len) {
if (command.s[0] == '?') {
doit("?",command.s + 1,command.len - 1);
}
else if ((command.s[0] == '|') || (command.s[0] == '!')) {
if (!stralloc_cat(&instr,&command)) nomem();
if (!stralloc_0(&instr)) nomem();
}
else if ((command.s[0] == '.') || (command.s[0] == '/')) {
if (!stralloc_cat(&instr,&command)) nomem();
if (!stralloc_0(&instr)) nomem();
}
else {
if (command.len > 800) longaddress();
if (command.s[0] != '&')
if (!stralloc_cats(&instr,"&")) nomem();
if (!stralloc_cat(&instr,&command)) nomem();
if (!stralloc_0(&instr)) nomem();
}
}
if (!stralloc_copys(&command,"")) nomem();
if (ch == ';') {
if (instr.len)
doit(":",instr.s,instr.len);
if (!stralloc_copys(&target,"")) nomem();
if (!stralloc_copys(&instr,"")) nomem();
flagtarget = 0;
}
continue;
}
if (ch == '\\') if (!getch(&ch)) goto EOF;
if (ch == 0) nulbyte();
if (!stralloc_append(flagtarget ? &command : &target,&ch)) nomem();
}
EOF:
if (flagtarget || target.len)
missingsemicolon();
if (cdb_make_finish(&cdb) == -1) writeerr();
if (fsync(fd) == -1) writeerr();
if (close(fd) == -1) writeerr(); /* NFS stupidity */
if (rename(fntmp,fncdb) == -1)
logmsg(WHO,111,FATAL,B("unable to move ",fntmp," to: ",fncdb));
_exit(0);
}
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