basic: add new rlimit_format() call

This formats a struct rlimit the way rlimit_parse() expects it.

3 files changed, 61 insertions, 0 deletions

diff --git a/src/basic/rlimit-util.c b/src/basic/rlimit-util.c
index 11476ac8d1..8a921a27cb 100644
--- a/src/basic/rlimit-util.c
+++ b/src/basic/rlimit-util.c
@@ -227,6 +227,30 @@ int rlimit_parse(int resource, const char *val, struct rlimit *ret) {
         return 0;
 }
 
+int rlimit_format(const struct rlimit *rl, char **ret) {
+        char *s = NULL;
+
+        assert(rl);
+        assert(ret);
+
+        if (rl->rlim_cur >= RLIM_INFINITY && rl->rlim_max >= RLIM_INFINITY)
+                s = strdup("infinity");
+        else if (rl->rlim_cur >= RLIM_INFINITY)
+                (void) asprintf(&s, "infinity:" RLIM_FMT, rl->rlim_max);
+        else if (rl->rlim_max >= RLIM_INFINITY)
+                (void) asprintf(&s, RLIM_FMT ":infinity", rl->rlim_cur);
+        else if (rl->rlim_cur == rl->rlim_max)
+                (void) asprintf(&s, RLIM_FMT, rl->rlim_cur);
+        else
+                (void) asprintf(&s, RLIM_FMT ":" RLIM_FMT, rl->rlim_cur, rl->rlim_max);
+
+        if (!s)
+                return -ENOMEM;
+
+        *ret = s;
+        return 0;
+}
+
 static const char* const rlimit_table[_RLIMIT_MAX] = {
         [RLIMIT_CPU] = "LimitCPU",
         [RLIMIT_FSIZE] = "LimitFSIZE",
diff --git a/src/basic/rlimit-util.h b/src/basic/rlimit-util.h
index fd2f7ff7cf..abf3c57934 100644
--- a/src/basic/rlimit-util.h
+++ b/src/basic/rlimit-util.h
@@ -33,4 +33,6 @@ int setrlimit_closest(int resource, const struct rlimit *rlim);
 int rlimit_parse_one(int resource, const char *val, rlim_t *ret);
 int rlimit_parse(int resource, const char *val, struct rlimit *ret);
 
+int rlimit_format(const struct rlimit *rl, char **ret);
+
 #define RLIMIT_MAKE_CONST(lim) ((struct rlimit) { lim, lim })
diff --git a/src/test/test-rlimit-util.c b/src/test/test-rlimit-util.c
index 24bfe7a60e..d9ac9368cd 100644
--- a/src/test/test-rlimit-util.c
+++ b/src/test/test-rlimit-util.c
@@ -17,12 +17,37 @@
 
 #include <sys/resource.h>
 
+#include "alloc-util.h"
 #include "capability-util.h"
 #include "macro.h"
 #include "rlimit-util.h"
 #include "string-util.h"
 #include "util.h"
 
+static void test_rlimit_parse_format(int resource, const char *string, rlim_t soft, rlim_t hard, int ret, const char *formatted) {
+        _cleanup_free_ char *f = NULL;
+        struct rlimit rl = {
+                .rlim_cur = 4711,
+                .rlim_max = 4712,
+        }, rl2 = {
+                .rlim_cur = 4713,
+                .rlim_max = 4714
+        };
+
+        assert_se(rlimit_parse(resource, string, &rl) == ret);
+        if (ret < 0)
+                return;
+
+        assert_se(rl.rlim_cur == soft);
+        assert_se(rl.rlim_max == hard);
+
+        assert_se(rlimit_format(&rl, &f) >= 0);
+        assert_se(streq(formatted, f));
+
+        assert_se(rlimit_parse(resource, formatted, &rl2) >= 0);
+        assert_se(memcmp(&rl, &rl2, sizeof(struct rlimit)) == 0);
+}
+
 int main(int argc, char *argv[]) {
         struct rlimit old, new, high;
         struct rlimit err = {
@@ -65,5 +90,15 @@ int main(int argc, char *argv[]) {
         assert_se(old.rlim_cur == new.rlim_cur);
         assert_se(old.rlim_max == new.rlim_max);
 
+        test_rlimit_parse_format(RLIMIT_NOFILE, "4:5", 4, 5, 0, "4:5");
+        test_rlimit_parse_format(RLIMIT_NOFILE, "6", 6, 6, 0, "6");
+        test_rlimit_parse_format(RLIMIT_NOFILE, "infinity", RLIM_INFINITY, RLIM_INFINITY, 0, "infinity");
+        test_rlimit_parse_format(RLIMIT_NOFILE, "infinity:infinity", RLIM_INFINITY, RLIM_INFINITY, 0, "infinity");
+        test_rlimit_parse_format(RLIMIT_NOFILE, "8:infinity", 8, RLIM_INFINITY, 0, "8:infinity");
+        test_rlimit_parse_format(RLIMIT_CPU, "25min:13h", (25*USEC_PER_MINUTE) / USEC_PER_SEC, (13*USEC_PER_HOUR) / USEC_PER_SEC, 0, "1500:46800");
+        test_rlimit_parse_format(RLIMIT_NOFILE, "", 0, 0, -EINVAL, NULL);
+        test_rlimit_parse_format(RLIMIT_NOFILE, "5:4", 0, 0, -EILSEQ, NULL);
+        test_rlimit_parse_format(RLIMIT_NOFILE, "5:4:3", 0, 0, -EINVAL, NULL);
+
         return 0;
 }