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#include <unistd.h>
#include <stdio.h> // rename
#undef EOF // used as a label
#include "buffer.h"
#include "case.h"
#include "cdbmake.h"
#include "logmsg.h"
#include "open.h"
#include "stralloc.h"
#define WHO "setforward"
static void usage()
{
logmsg(WHO, 100, USAGE, "setforward data.cdb data.tmp");
}
static void nomem()
{
logmsg(WHO, 111, FATAL, "out of memory");
}
static void missingsemicolon()
{
logmsg(WHO, 100, FATAL, "final instruction must end with semicolon");
}
static void extracolon()
{
logmsg(WHO, 100, FATAL, "double colons are not permitted");
}
static void extracomma()
{
logmsg(WHO, 100, FATAL, "commas are not permitted before colons");
}
static void nulbyte()
{
logmsg(WHO, 100, FATAL, "NUL bytes are not permitted");
}
static 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 */
static void writeerr()
{
logmsg(WHO, 111, FATAL, B("unable to write to: ", fntmp));
}
static void doit(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();
}
static int getch(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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