Rename proc_getent to rc_proc_getent and make it global

src/librc/librc-misc.c

@@ -29,6 +29,7 @@
  */
 
 #include "librc.h"
+#include "einfo.h"
 
 bool
 rc_yesno(const char *value)
@@ -127,6 +128,53 @@ rc_getline(char **line, size_t *len, FILE *fp)
 }
 librc_hidden_def(rc_getline)
 
+#ifdef __linux__
+char *
+rc_proc_getent(const char *ent)
+{
+	FILE *fp;
+	char *proc, *p, *value = NULL;
+	size_t i, len;
+
+	if (!exists("/proc/cmdline"))
+		return NULL;
+
+	if (!(fp = fopen("/proc/cmdline", "r"))) {
+		eerror("failed to open `/proc/cmdline': %s", strerror(errno));
+		return NULL;
+	}
+
+	proc = NULL;
+	i = 0;
+	if (rc_getline(&proc, &i, fp) == -1 || proc == NULL)
+		eerror("rc_getline: %s", strerror(errno));
+
+	if (proc != NULL) {
+		len = strlen(ent);
+
+		while ((p = strsep(&proc, " "))) {
+			if (strncmp(ent, p, len) == 0 && (p[len] == '\0' || p[len] == ' ' || p[len] == '=')) {
+				p += len;
+
+				if (*p == '=')
+					p++;
+
+				value = xstrdup(p);
+			}
+		}
+	}
+
+	if (!value)
+		errno = ENOENT;
+
+	fclose(fp);
+	free(proc);
+
+	return value;
+}
+librc_hidden_def(rc_proc_getent)
+#endif
+
 RC_STRINGLIST *
 rc_config_list(const char *file)
 {

src/librc/librc.h

@@ -87,6 +87,7 @@ librc_hidden_proto(rc_find_pids)
 librc_hidden_proto(rc_getfile)
 librc_hidden_proto(rc_getline)
 librc_hidden_proto(rc_newer_than)
+librc_hidden_proto(rc_proc_getent)
 librc_hidden_proto(rc_older_than)
 librc_hidden_proto(rc_runlevel_exists)
 librc_hidden_proto(rc_runlevel_get)

src/librc/rc.h.in

@@ -361,6 +361,13 @@ bool rc_newer_than(const char *, const char *, time_t *, char *);
  * @return true if source is older than target, otherwise false */
 bool rc_older_than(const char *, const char *, time_t *, char *);
 
+#ifdef __linux__
+/*! Read variables/values from /proc/cmdline
+ * @param value
+ * @return pointer to the value, otherwise NULL */
+char *rc_proc_getent(const char *);
+#endif
+
 /*! Update the cached dependency tree if it's older than any init script,
  * its configuration file or an external configuration file the init script
  * has specified.

src/librc/rc.map

@@ -18,6 +18,7 @@ global:
 	rc_getline;
 	rc_newer_than;
 	rc_older_than;
+	rc_proc_getent;
 	rc_runlevel_exists;
 	rc_runlevel_get;
 	rc_runlevel_list;