From ce9c8acfc4b070686953234637764ebd0c0a1192 Mon Sep 17 00:00:00 2001
From: Zhao Zhili <zhilizhao@tencent.com>
Date: Sun, 30 Jun 2024 18:33:18 +0800
Subject: [PATCH] avutil/file_open: Fix build error with wasi

Don't assume tempnam is available when !HAVE_MKSTEMP. Check tempnam
explicitly in configure.

Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
Signed-off-by: Paul B Mahol <onemda@gmail.com>
---
 configure             | 2 ++
 libavutil/file_open.c | 8 +++++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/configure b/configure
index 45a05c026e..906760c996 100755
--- a/configure
+++ b/configure
@@ -2408,6 +2408,7 @@ SYSTEM_FUNCS="
     sysconf
     sysctl
     sysctlbyname
+    tempnam
     usleep
     UTGetOSTypeFromString
     VirtualAlloc
@@ -6542,6 +6543,7 @@ check_struct "sys/stat.h" "struct stat" st_mtim.tv_nsec -D_BSD_SOURCE
 check_func  strerror_r
 check_func  sysconf
 check_func  sysctl
+check_func  tempnam
 check_func  usleep
 
 check_func_headers conio.h kbhit
diff --git a/libavutil/file_open.c b/libavutil/file_open.c
index ab08e5d67f..24f1a02592 100644
--- a/libavutil/file_open.c
+++ b/libavutil/file_open.c
@@ -111,7 +111,10 @@ int avpriv_tempfile(const char *prefix, char **filename, int log_offset, void *l
 {
     FileLogContext file_log_ctx = { &file_log_ctx_class, log_offset, log_ctx };
     int fd = -1;
-#if !HAVE_MKSTEMP
+#if HAVE_MKSTEMP
+    size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
+    *filename  = av_malloc(len);
+#elif HAVE_TEMPNAM
     void *ptr= tempnam(NULL, prefix);
     if(!ptr)
         ptr= tempnam(".", prefix);
@@ -119,8 +122,7 @@ int avpriv_tempfile(const char *prefix, char **filename, int log_offset, void *l
 #undef free
     free(ptr);
 #else
-    size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
-    *filename  = av_malloc(len);
+    return AVERROR(ENOSYS);
 #endif
     /* -----common section-----*/
     if (!*filename) {