[nongnu] elpa/pdf-tools bea5ddb9fc 3/3: synctex_parser: fix vasprintf() not exists in non-GNU environment (#134)

[ELPA Syncer]

branch: elpa/pdf-tools
commit bea5ddb9fc234b48db6df3dcb66d75e76bec00c8
Author: lin.sun <sunlin7@hotmail.com>
Commit: GitHub <noreply@github.com>

    synctex_parser: fix vasprintf() not exists in non-GNU environment (#134)
    
    The vasprintf() is a GNU extension function, missed in non-GNU build 
environment, so we define it.
    
    Without this change, there will have error message when we build with clang:
    ```
    ./autogen.sh
    ./configure CC=clang
    make
    ```
    
    We will get errors:
    ```
    synctex_parser.c:8448:13: error: call to undeclared function 'vasprintf'; 
ISO C99 and later do not support implicit function declarations 
[-Wimplicit-function-declaration]
            if (vasprintf(&buffer, format, va) < 0) {
    ```
    
    This change fixes the problem.
---
 server/configure.ac     | 2 +-
 server/synctex_parser.c | 8 +++-----
 2 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/server/configure.ac b/server/configure.ac
index 9a8c46db71..efcc646ba8 100644
--- a/server/configure.ac
+++ b/server/configure.ac
@@ -84,7 +84,7 @@ AC_C_BIGENDIAN
 # Checks for library functions.
 AC_FUNC_ERROR_AT_LINE
 AC_FUNC_STRTOD
-AC_CHECK_FUNCS([strcspn strtol getline])
+AC_CHECK_FUNCS([strcspn strtol getline vasprintf])
 
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT
diff --git a/server/synctex_parser.c b/server/synctex_parser.c
index 27be60896c..4eddb83424 100644
--- a/server/synctex_parser.c
+++ b/server/synctex_parser.c
@@ -8415,9 +8415,7 @@ static int _synctex_updater_print(synctex_updater_p 
updater, const char * format
     }
     return result;
 }
-#if defined(_MSC_VER)
-#include <stdio.h>
-#include <stdlib.h>
+#ifndef HAVE_VASPRINTF
 #include <stdarg.h>
 
 static int vasprintf(char **ret,
@@ -8425,11 +8423,11 @@ static int vasprintf(char **ret,
                      va_list ap)
 {
     int len;
-    len = _vsnprintf(NULL, 0, format, ap);
+    len = vsnprintf(NULL, 0, format, ap);
     if (len < 0) return -1;
     *ret = malloc(len + 1);
     if (!*ret) return -1;
-    _vsnprintf(*ret, len+1, format, ap);
+    vsnprintf(*ret, len + 1, format, ap);
     (*ret)[len] = '\0';
     return len;
 }