From 4f4d04f00b768157cde2c4b457377d70c61b4692 Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Fri, 14 Aug 2020 16:57:42 -0400
Subject: implement

---
 src/grp/endgrent.c |  6 +++++
 src/grp/getgrent.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
 src/grp/getgrgid.c | 14 ++++++++--
 src/grp/getgrnam.c | 15 +++++++++--
 src/grp/setgrent.c |  5 ++++
 5 files changed, 110 insertions(+), 5 deletions(-)

(limited to 'src')

diff --git a/src/grp/endgrent.c b/src/grp/endgrent.c
index f9e84d81..00e4beb1 100644
--- a/src/grp/endgrent.c
+++ b/src/grp/endgrent.c
@@ -1,7 +1,13 @@
 #include <grp.h>
+#include "_grp.h"
+#include "stdio.h"
 
 void endgrent(void)
 {
+	if (__grp.db != NULL) {
+		fclose(__grp.db);
+		__grp.db = NULL;
+	}
 }
 
 /*
diff --git a/src/grp/getgrent.c b/src/grp/getgrent.c
index 228f916c..aac4e175 100644
--- a/src/grp/getgrent.c
+++ b/src/grp/getgrent.c
@@ -1,9 +1,82 @@
+#include "sys/types.h"
 #include <grp.h>
 #include "stddef.h"
+#include "stdio.h"
+#include "limits.h"
+#include "string.h"
+#include "_config.h"
+#include "_grp.h"
+
+#ifndef LINE_MAX
+#define LINE_MAX _POSIX2_LINE_MAX
+#endif
+
+#ifndef _XOPEN_SOURCE
+	static
+#endif
 
 struct group * getgrent(void)
 {
-	return NULL;
+	static char buf[LINE_MAX + 1];
+	char *group, *password, *gid, *members, *nl;
+	int member = 0;
+
+	/* TODO: attempt first calling _GRP_CMD */
+
+	if (__grp.db == NULL) {
+		__grp.db = fopen(_GRP_DB, "r");
+		if (__grp.db == NULL) {
+			return NULL;
+		}
+	}
+
+	if (fgets(buf, sizeof(buf), __grp.db) == NULL) {
+		endgrent();
+		return NULL;
+	}
+
+	group = buf;
+	if ((password = strchr(buf, ':')) != NULL) {
+		*password = '\0';
+		password++;
+	} else {
+		return NULL;
+	}
+
+	if ((gid = strchr(password, ':')) != NULL) {
+		*gid = '\0';
+		gid++;
+	} else {
+		return NULL;
+	}
+
+	if ((members = strchr(gid, ':')) != NULL) {
+		*members = '\0';
+		members++;
+		if ((nl = strchr(members, '\n')) != NULL) {
+			*nl = '\0';
+		}
+	} else {
+		return NULL;
+	}
+
+	__grp.grp.gr_name = group;
+	__grp.grp.gr_gid = strtoul(gid, NULL, 10);
+
+	while (members && *members) {
+		__grp.members[member++] = members;
+		members = strchr(members, ',');
+		if (members) {
+			*members = '\0';
+			members++;
+		}
+	}
+
+	__grp.members[member] = NULL;
+
+	__grp.grp.gr_mem = __grp.members;
+
+	return &__grp.grp;
 }
 
 /*
diff --git a/src/grp/getgrgid.c b/src/grp/getgrgid.c
index 0d39ffc2..af10469c 100644
--- a/src/grp/getgrgid.c
+++ b/src/grp/getgrgid.c
@@ -1,10 +1,20 @@
 #include "sys/types.h"
 #include <grp.h>
-#include "stddef.h"
+#include "_grp.h"
 
 struct group * getgrgid(gid_t gid)
 {
-	(void)gid;
+	struct group *grp = NULL;
+	setgrent();
+
+	while ((grp = getgrent()) != NULL) {
+		if (grp->gr_gid == gid) {
+			endgrent();
+			return grp;
+		}
+	}
+
+	endgrent();
 	return NULL;
 }
 
diff --git a/src/grp/getgrnam.c b/src/grp/getgrnam.c
index c3598866..493a6b5a 100644
--- a/src/grp/getgrnam.c
+++ b/src/grp/getgrnam.c
@@ -1,10 +1,21 @@
 #include "sys/types.h"
 #include <grp.h>
-#include "stddef.h"
+#include "_grp.h"
+#include "string.h"
 
 struct group * getgrnam(const char * name)
 {
-	(void)name;
+	struct group *grp = NULL;
+	setgrent();
+
+	while ((grp = getgrent()) != NULL) {
+	if (strcmp(name, grp->gr_name) == 0) {
+			endgrent();
+			return grp;
+		}
+	}
+
+	endgrent();
 	return NULL;
 }
 
diff --git a/src/grp/setgrent.c b/src/grp/setgrent.c
index 17b5872b..4e445404 100644
--- a/src/grp/setgrent.c
+++ b/src/grp/setgrent.c
@@ -1,7 +1,12 @@
 #include <grp.h>
+#include "_grp.h"
+#include "stdio.h"
 
 void setgrent(void)
 {
+	if (__grp.db != NULL) {
+		rewind(__grp.db);
+	}
 }
 
 /*
-- 
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