Add environment spoofing

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 40 insertions, 0 deletions

diff --git a/libfonts_gethome__.c b/libfonts_gethome__.c
new file mode 100644
index 0000000..902029f
--- /dev/null
+++ b/libfonts_gethome__.c
@@ -0,0 +1,40 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+char *
+libfonts_gethome__(struct libfonts_context *ctx)
+{
+	uid_t uid = (ctx && ctx->use_context_uid) ? ctx->uid : getuid();
+	size_t size = 512;
+	char *buf = NULL, *new;
+	char *ret = NULL;
+	struct passwd pw, *pwp;
+	int err;
+
+	goto beginning;
+
+	do {
+		if (size > SIZE_MAX / 2)
+			goto enomem;
+		size *= 2;
+	beginning:
+		new = realloc(buf, size);
+		if (!new) {
+		enomem:
+			free(buf);
+			errno = ENOMEM;
+			return NULL;
+		}
+		buf = new;
+	} while ((err = getpwuid_r(uid, &pw, buf, size, &pwp)) == ERANGE);
+	if (err) {
+		free(buf);
+		return NULL;
+	}
+
+	if (pwp && pwp->pw_dir)
+		ret = strdup(pwp->pw_dir);
+	free(buf);
+	return ret;
+}