From c6ef89664b8c0d7aa85bddd5c7014aa6df82cbe7 Mon Sep 17 00:00:00 2001
From: tcsullivan <tullivan99@gmail.com>
Date: Sat, 17 Nov 2018 13:02:57 -0500
Subject: added pdclib, removed sash

---
 .../platform/example/functions/stdlib/getenv.c     | 45 +++++++++++++++++
 .../platform/example/functions/stdlib/system.c     | 57 ++++++++++++++++++++++
 2 files changed, 102 insertions(+)
 create mode 100644 src/pdclib/platform/example/functions/stdlib/getenv.c
 create mode 100644 src/pdclib/platform/example/functions/stdlib/system.c

(limited to 'src/pdclib/platform/example/functions/stdlib')

diff --git a/src/pdclib/platform/example/functions/stdlib/getenv.c b/src/pdclib/platform/example/functions/stdlib/getenv.c
new file mode 100644
index 0000000..72bbcd2
--- /dev/null
+++ b/src/pdclib/platform/example/functions/stdlib/getenv.c
@@ -0,0 +1,45 @@
+/* getenv( const char * )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+/* This is an example implementation of getenv() fit for use with POSIX kernels.
+*/
+
+#include <string.h>
+#include <stdlib.h>
+
+#ifndef REGTEST
+
+extern char * * environ;
+
+char * getenv( const char * name )
+{
+    size_t len = strlen( name );
+    size_t index = 0;
+    while ( environ[ index ] != NULL )
+    {
+        if ( strncmp( environ[ index ], name, len ) == 0 )
+        {
+            return environ[ index ] + len + 1;
+        }
+        index++;
+    }
+    return NULL;
+}
+
+#endif
+
+#ifdef TEST
+
+#include "_PDCLIB_test.h"
+
+int main( void )
+{
+    TESTCASE( strcmp( getenv( "SHELL" ), "/bin/bash" ) == 0 );
+    /* TESTCASE( strcmp( getenv( "SHELL" ), "/bin/sh" ) == 0 ); */
+    return TEST_RESULTS;
+}
+
+#endif
diff --git a/src/pdclib/platform/example/functions/stdlib/system.c b/src/pdclib/platform/example/functions/stdlib/system.c
new file mode 100644
index 0000000..15603c3
--- /dev/null
+++ b/src/pdclib/platform/example/functions/stdlib/system.c
@@ -0,0 +1,57 @@
+/* system( const char * )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stdlib.h>
+
+/* This is an example implementation of system() fit for use with POSIX kernels.
+*/
+
+extern int fork( void );
+extern int execve( const char * filename, char * const argv[], char * const envp[] );
+extern int wait( int * status );
+
+int system( const char * string )
+{
+    const char * argv[] = { "sh", "-c", NULL, NULL };
+    argv[2] = string;
+    if ( string != NULL )
+    {
+        int pid = fork();
+        if ( pid == 0 )
+        {
+            execve( "/bin/sh", (char * * const)argv, NULL );
+        }
+        else if ( pid > 0 )
+        {
+            while( wait( NULL ) != pid );
+        }
+    }
+    return -1;
+}
+
+#ifdef TEST
+
+#include "_PDCLIB_test.h"
+
+#define SHELLCOMMAND "echo 'SUCCESS testing system()'"
+
+int main( void )
+{
+    FILE * fh;
+    char buffer[25];
+    buffer[24] = 'x';
+    TESTCASE( ( fh = freopen( testfile, "wb+", stdout ) ) != NULL );
+    TESTCASE( system( SHELLCOMMAND ) );
+    rewind( fh );
+    TESTCASE( fread( buffer, 1, 24, fh ) == 24 );
+    TESTCASE( memcmp( buffer, "SUCCESS testing system()", 24 ) == 0 );
+    TESTCASE( buffer[24] == 'x' );
+    TESTCASE( fclose( fh ) == 0 );
+    TESTCASE( remove( testfile ) == 0 );
+    return TEST_RESULTS;
+}
+
+#endif
-- 
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