ncd: add extra/build_cmdline, to be used by the upcoming sys.start_process() module

ncd/CMakeLists.txt

@@ -35,6 +35,7 @@ if (NOT EMSCRIPTEN)
 
     list(APPEND NCD_ADDITIONAL_SOURCES
         NCDIfConfig.c
+        extra/build_cmdline.c
         modules/command_template.c
         modules/event_template.c
         modules/regex_match.c

ncd/extra/build_cmdline.c

@@ -0,0 +1,110 @@
+/**
+ * @file build_cmdline.c
+ * @author Ambroz Bizjak <ambrop7@gmail.com>
+ * 
+ * @section LICENSE
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the author nor the
+ *    names of its contributors may be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdlib.h>
+
+#include <misc/debug.h>
+#include <ncd/extra/value_utils.h>
+
+#include "build_cmdline.h"
+
+int ncd_build_cmdline (NCDModuleInst *i, int log_channel, NCDValRef cmd_arg, char **out_exec, CmdLine *out_cl)
+{
+    ASSERT(!NCDVal_IsInvalid(cmd_arg))
+    ASSERT(out_exec)
+    ASSERT(out_cl)
+    
+    if (!NCDVal_IsList(cmd_arg)) {
+        NCDModuleInst_Backend_Log(i, log_channel, BLOG_ERROR, "wrong type");
+        goto fail0;
+    }
+    
+    size_t count = NCDVal_ListCount(cmd_arg);
+    
+    // read exec
+    if (count == 0) {
+        NCDModuleInst_Backend_Log(i, log_channel, BLOG_ERROR, "missing executable name");
+        goto fail0;
+    }
+    NCDValRef exec_arg = NCDVal_ListGet(cmd_arg, 0);
+    if (!NCDVal_IsStringNoNulls(exec_arg)) {
+        NCDModuleInst_Backend_Log(i, log_channel, BLOG_ERROR, "wrong type");
+        goto fail0;
+    }
+    char *exec = ncd_strdup(exec_arg);
+    if (!exec) {
+        NCDModuleInst_Backend_Log(i, log_channel, BLOG_ERROR, "ncd_strdup failed");
+        goto fail0;
+    }
+    
+    // start cmdline
+    CmdLine cl;
+    if (!CmdLine_Init(&cl)) {
+        NCDModuleInst_Backend_Log(i, log_channel, BLOG_ERROR, "CmdLine_Init failed");
+        goto fail1;
+    }
+    
+    // add header
+    if (!CmdLine_Append(&cl, exec)) {
+        NCDModuleInst_Backend_Log(i, log_channel, BLOG_ERROR, "CmdLine_Append failed");
+        goto fail2;
+    }
+    
+    // add additional arguments
+    for (size_t j = 1; j < count; j++) {
+        NCDValRef arg = NCDVal_ListGet(cmd_arg, j);
+        
+        if (!NCDVal_IsStringNoNulls(arg)) {
+            NCDModuleInst_Backend_Log(i, log_channel, BLOG_ERROR, "wrong type");
+            goto fail2;
+        }
+        
+        if (!CmdLine_AppendNoNull(&cl, NCDVal_StringData(arg), NCDVal_StringLength(arg))) {
+            NCDModuleInst_Backend_Log(i, log_channel, BLOG_ERROR, "CmdLine_AppendNoNull failed");
+            goto fail2;
+        }
+    }
+    
+    // finish
+    if (!CmdLine_Finish(&cl)) {
+        NCDModuleInst_Backend_Log(i, log_channel, BLOG_ERROR, "CmdLine_Finish failed");
+        goto fail2;
+    }
+    
+    *out_exec = exec;
+    *out_cl = cl;
+    return 1;
+    
+fail2:
+    CmdLine_Free(&cl);
+fail1:
+    free(exec);
+fail0:
+    return 0;
+}

ncd/extra/build_cmdline.h

@@ -0,0 +1,38 @@
+/**
+ * @file build_cmdline.h
+ * @author Ambroz Bizjak <ambrop7@gmail.com>
+ * 
+ * @section LICENSE
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the author nor the
+ *    names of its contributors may be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef NCD_BUILD_CMDLINE_H
+#define NCD_BUILD_CMDLINE_H
+
+#include <ncd/NCDModule.h>
+#include <misc/cmdline.h>
+
+int ncd_build_cmdline (NCDModuleInst *i, int log_channel, NCDValRef cmd_arg, char **exec, CmdLine *cl);
+
+#endif