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Code Issues Releases Wiki Activity

Cleanup: split rdsvc into multiple functions

Browse source 
Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
This commit is contained in:
David Oberhollenzer 2018-04-08 13:30:20 +02:00
parent b81668e045
commit 7d8ceb810f
2 changed files with 108 additions and 89 deletions
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3
lib/src/delsvc.c
View file

@ -23,6 +23,9 @@ void delsvc(service_t *svc)
{
exec_t *e;
if (svc == NULL)
return;
while (svc->exec != NULL) {
e = svc->exec;
svc->exec = e->next;

194
lib/src/rdsvc.c
View file

@ -220,7 +220,7 @@ static int svc_target(service_t *svc, char *arg,
return 0;
}
static const struct {
static const struct svc_param {
const char *key;
int (*handle)(service_t *svc, char *arg,
@ -236,12 +236,97 @@ static const struct {
};
static char *get_line(int fd, const char *filename, size_t *lineno,
int argc, const char *const *args)
{
const char *error;
char *line;
int ret;
retry:
errno = 0;
line = rdline(fd, argc, args);
ret = errno;
if (line == NULL && errno != 0) {
switch (errno) {
case EINVAL: error = "error in argument expansion"; break;
case ELOOP: error = "recursive argument expansion"; break;
case EILSEQ: error = "missing \""; break;
default: error = strerror(errno); break;
}
fprintf(stderr, "%s: %zu: %s\n", filename, *lineno, error);
}
if (line != NULL && strlen(line) == 0) {
free(line);
(*lineno) += 1;
goto retry;
}
errno = ret;
return line;
}
static int splitkv(const char *filename, size_t lineno,
char *line, char **k, char **v)
{
char *key = line, *value = line;
*k = *v = NULL;
while (*value != ' ' && *value != '\0') {
if (!isalpha(*value)) {
fprintf(stderr,
"%s: %zu: unexpected '%c' in keyword\n",
filename, lineno, *value);
return -1;
}
++value;
}
if (*value != ' ') {
fprintf(stderr, "%s: %zu: expected argument after '%s'\n",
filename, lineno, key);
return -1;
}
*(value++) = '\0';
value = strdup(value);
if (value == NULL) {
fprintf(stderr, "%s: %zu: out of memory\n", filename, lineno);
return -1;
}
*k = key;
*v = value;
return 0;
}
static const struct svc_param *find_param(const char *filename, size_t lineno,
const char *name)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(svc_params); ++i) {
if (!strcmp(svc_params[i].key, name))
return svc_params + i;
}
fprintf(stderr, "%s: %zu: unknown keyword '%s'\n",
filename, lineno, name);
return NULL;
}
service_t *rdsvc(int dirfd, const char *filename)
{
const char *arg, *args[1], *error;
char *line, *key, *value;
size_t i, argc, lineno;
service_t *svc;
char *line = NULL, *key, *value = NULL;
const struct svc_param *p;
const char *arg, *args[1];
service_t *svc = NULL;
size_t argc, lineno;
int fd;
fd = openat(dirfd, filename, O_RDONLY);
@ -259,11 +344,8 @@ service_t *rdsvc(int dirfd, const char *filename)
}
svc = calloc(1, sizeof(*svc));
if (svc == NULL) {
fputs("out of memory\n", stderr);
close(fd);
return NULL;
}
if (svc == NULL)
goto fail_oom;
if (arg != NULL) {
svc->name = strndup(filename, arg - filename);
@ -271,101 +353,35 @@ service_t *rdsvc(int dirfd, const char *filename)
svc->name = strdup(filename);
}
if (svc->name == NULL) {
free(svc);
fputs("out of memory\n", stderr);
close(fd);
return NULL;
}
if (svc->name == NULL)
goto fail_oom;
for (lineno = 1; ; ++lineno) {
errno = 0;
line = rdline(fd, argc, args);
line = get_line(fd, filename, &lineno, argc, args);
if (line == NULL) {
if (errno == 0)
break;
switch (errno) {
case EINVAL:
error = "error in argument expansion";
break;
case ELOOP:
error = "recursive argument expansion";
break;
case EILSEQ:
error = "missing \"";
break;
default:
error = strerror(errno);
break;
}
fprintf(stderr, "%s: %zu: %s\n",
filename, lineno, error);
goto fail;
}
if (!strlen(line)) {
free(line);
continue;
}
if (splitkv(filename, lineno, line, &key, &value))
goto fail;
key = value = line;
while (*value != ' ' && *value != '\0') {
if (!isalpha(*value)) {
fprintf(stderr, "%s: %zu: unexpected '%c' in "
"keyword\n", filename, lineno, *value);
goto fail_line;
}
++value;
}
if (*value == ' ') {
*(value++) = '\0';
} else {
value = NULL;
}
for (i = 0; i < ARRAY_SIZE(svc_params); ++i) {
if (!strcmp(svc_params[i].key, key))
break;
}
if (i >= ARRAY_SIZE(svc_params)) {
fprintf(stderr, "%s: %zu: unknown keyword '%s'\n",
filename, lineno, key);
goto fail_line;
}
if (value == NULL) {
fprintf(stderr,
"%s: %zu: expected argument after '%s'\n",
filename, lineno, key);
goto fail_line;
}
value = strdup(value);
if (value == NULL) {
fputs("out of memory", stderr);
goto fail_line;
}
if (svc_params[i].handle(svc, value, filename, lineno)) {
free(value);
goto fail_line;
}
p = find_param(filename, lineno, key);
if (p == NULL || p->handle(svc, value, filename, lineno) != 0)
goto fail;
free(line);
}
close(fd);
return svc;
fail_line:
free(line);
fail_oom:
fputs("out of memory\n", stderr);
fail:
close(fd);
free(value);
free(line);
delsvc(svc);
close(fd);
return NULL;
}