struct regexp *
regexp_minus(struct info *info, struct regexp *r1, struct regexp *r2) {
struct regexp *result = NULL;
struct fa *fa = NULL, *fa1 = NULL, *fa2 = NULL;
int r;
char *s = NULL;
size_t s_len;
fa1 = regexp_to_fa(r1);
ERR_BAIL(r1->info);
fa2 = regexp_to_fa(r2);
ERR_BAIL(r2->info);
fa = fa_minus(fa1, fa2);
if (fa == NULL)
goto error;
r = fa_as_regexp(fa, &s, &s_len);
if (r < 0)
goto error;
if (s == NULL) {
/* FA is the empty set, which we can't represent as a regexp */
goto error;
}
if (regexp_c_locale(&s, NULL) < 0)
goto error;
result = make_regexp(info, s, fa_is_nocase(fa));
s = NULL;
done:
fa_free(fa);
fa_free(fa1);
fa_free(fa2);
free(s);
return result;
error:
unref(result, regexp);
goto done;
}
struct regexp *
regexp_union_n(struct info *info, int n, struct regexp **r) {
size_t len = 0;
char *pat = NULL, *p, *expanded = NULL;
int nnocase = 0, npresent = 0;
int ret;
for (int i=0; i < n; i++)
if (r[i] != NULL) {
len += strlen(r[i]->pattern->str) + strlen("()|");
npresent += 1;
if (r[i]->nocase)
nnocase += 1;
}
bool mixedcase = nnocase > 0 && nnocase < npresent;
if (len == 0)
return NULL;
if (ALLOC_N(pat, len) < 0)
return NULL;
p = pat;
int added = 0;
for (int i=0; i < n; i++) {
if (r[i] == NULL)
continue;
if (added > 0)
*p++ = '|';
*p++ = '(';
if (mixedcase && r[i]->nocase) {
expanded = regexp_expand_nocase(r[i]);
ERR_BAIL(r[i]->info);
len += strlen(expanded) - strlen(r[i]->pattern->str);
ret = REALLOC_N(pat, len);
ERR_NOMEM(ret < 0, info);
p = pat + strlen(pat);
p = stpcpy(p, expanded);
FREE(expanded);
} else {
p = stpcpy(p, r[i]->pattern->str);
}
*p++ = ')';
added += 1;
}
*p = '\0';
return make_regexp(info, pat, nnocase == npresent);
error:
FREE(expanded);
FREE(pat);
return NULL;
}
struct regexp *
regexp_concat_n(struct info *info, int n, struct regexp **r) {
size_t len = 0;
char *pat = NULL, *p, *expanded = NULL;
int nnocase = 0, npresent = 0;
for (int i=0; i < n; i++)
if (r[i] != NULL) {
len += strlen(r[i]->pattern->str) + strlen("()");
npresent += 1;
if (r[i]->nocase)
nnocase += 1;
}
bool mixedcase = nnocase > 0 && nnocase < npresent;
if (len == 0)
return NULL;
len += 1;
if (ALLOC_N(pat, len) < 0)
return NULL;
p = pat;
for (int i=0; i < n; i++) {
if (r[i] == NULL)
continue;
*p++ = '(';
if (mixedcase && r[i]->nocase) {
p = append_expanded(r[i], &pat, p, &len);
ERR_BAIL(r[i]->info);
} else {
p = stpcpy(p, r[i]->pattern->str);
}
*p++ = ')';
}
*p = '\0';
return make_regexp(info, pat, nnocase == npresent);
error:
FREE(expanded);
FREE(pat);
return NULL;
}
static char *append_expanded(struct regexp *r, char **pat, char *p,
size_t *len) {
char *expanded = NULL;
size_t ofs = p - *pat;
int ret;
expanded = regexp_expand_nocase(r);
ERR_BAIL(r->info);
*len += strlen(expanded) - strlen(r->pattern->str);
ret = REALLOC_N(*pat, *len);
ERR_NOMEM(ret < 0, r->info);
p = stpcpy(*pat + ofs, expanded);
error:
FREE(expanded);
return p;
}
/**
* Run a command without using the shell.
*
* return 0 if the command run and exited with 0 status; Otherwise
* return -1
*
*/
int run_program(struct netcf *ncf, const char *const *argv, char **output)
{
pid_t childpid = -1;
int exitstatus, waitret;
char *argv_str;
int ret = -1;
char errbuf[128];
char *outtext = NULL;
int outfd = -1;
FILE *outfile = NULL;
size_t outlen;
if (!output)
output = &outtext;
argv_str = argv_to_string(argv);
ERR_NOMEM(argv_str == NULL, ncf);
exec_program(ncf, argv, argv_str, &childpid, &outfd);
ERR_BAIL(ncf);
printf("Attempting to execute %s\n", argv_str);
outfile = fdopen(outfd, "r");
ERR_THROW_STRERROR(outfile == NULL,ncf, EEXEC,
"Failed to create file stream for output while executing '%s': %s",
argv_str, errbuf);
*output = fread_file(outfile, &outlen);
ERR_THROW_STRERROR(*output == NULL, ncf, EEXEC,
"Error while reading output from execution of '%s': %s",
argv_str, errbuf);
/* finished with the stream. Close it so the child can exit. */
fclose(outfile);
outfile = NULL;
while ((waitret = waitpid(childpid, &exitstatus, 0) == -1) &&
errno == EINTR) {
/* empty loop */
}
ERR_THROW_STRERROR(waitret == -1, ncf, EEXEC,
"Failed waiting for completion of '%s': %s",
argv_str, errbuf);
ERR_THROW(!WIFEXITED(exitstatus) && WIFSIGNALED(exitstatus), ncf, EEXEC,
"'%s' terminated by signal: %d",
argv_str, WTERMSIG(exitstatus));
ERR_THROW(!WIFEXITED(exitstatus), ncf, EEXEC,
"'%s' terminated improperly", argv_str);
ERR_THROW(WEXITSTATUS(exitstatus) == EXIT_ENOENT, ncf, EEXEC,
"Running '%s' program not found", argv_str);
ERR_THROW(WEXITSTATUS(exitstatus) == EXIT_CANNOT_INVOKE, ncf, EEXEC,
"Running '%s' program located but not usable", argv_str);
ERR_THROW(WEXITSTATUS(exitstatus) == EXIT_SIGMASK, ncf, EEXEC,
"Running '%s' failed to reset child process signal mask",
argv_str);
ERR_THROW(WEXITSTATUS(exitstatus) == EXIT_DUP2, ncf, EEXEC,
"Running '%s' failed to dup2 child process stdout/stderr",
argv_str);
ERR_THROW(WEXITSTATUS(exitstatus) == EXIT_INVALID_IN_THIS_STATE, ncf, EINVALIDOP,
"Running '%s' operation is invalid in this state",
argv_str);
ERR_THROW(WEXITSTATUS(exitstatus) != 0, ncf, EEXEC,
"Running '%s' failed with exit code %d: %s",
argv_str, WEXITSTATUS(exitstatus), *output);
ret = 0;
error:
if (outfile)
fclose(outfile);
else if (outfd >= 0)
close(outfd);
FREE(outtext);
FREE(argv_str);
return ret;
}
