[C] Update README and adding object.c/h files (#2377)

* modify handing reserved keyword and set isEnum in local codegen to avoid conflict with other codegen

* update README mustache

* added object header and body mustache

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/CLibcurlClientCodegen.java

@@ -205,6 +205,9 @@ public class CLibcurlClientCodegen extends DefaultCodegen implements CodegenConf
         supportingFiles.add(new SupportingFile("cJSON.c.mustache", "external", "cJSON.c"));
         supportingFiles.add(new SupportingFile("cJSON.h.mustache", "external", "cJSON.h"));
 
+        // Object files in model folder
+        supportingFiles.add(new SupportingFile("object-body.mustache", "model", "object.c"));
+        supportingFiles.add(new SupportingFile("object-header.mustache", "model", "object.h"));
     }
 
     @Override
@@ -333,6 +336,9 @@ public class CLibcurlClientCodegen extends DefaultCodegen implements CodegenConf
     @Override
     public String toParamName(String name) {
         // should be the same as variable name
+        if (name.matches("^\\d.*")) {
+            name = escapeReservedWord(name);
+        }
         name = name.replaceAll("-","_");
         return name;
     }
@@ -412,11 +418,15 @@ public class CLibcurlClientCodegen extends DefaultCodegen implements CodegenConf
 
     @Override
     public String toEnumValue(String value, String datatype) {
+        value = value.replaceAll("-","_");
+        if (isReservedWord(value)) {
+            value = escapeReservedWord(value);
+        }
         if ("Integer".equals(datatype) || "Float".equals(datatype)) {
             return value;
         } else {
             if (value.matches("\\d.*")) { // starts with number
-                return "N" + escapeText(value);
+                return escapeReservedWord(escapeText(value));
             } else {
                 return escapeText(value);
             }
@@ -444,7 +454,7 @@ public class CLibcurlClientCodegen extends DefaultCodegen implements CodegenConf
         enumName = enumName.replaceFirst("_$", "");
 
         if (enumName.matches("\\d.*")) { // starts with number
-            return "N" + enumName;
+            return escapeReservedWord(enumName);
         } else {
             return enumName;
         }
@@ -457,7 +467,7 @@ public class CLibcurlClientCodegen extends DefaultCodegen implements CodegenConf
         enumName = enumName.replaceFirst("_$", "");
 
         if (enumName.matches("\\d.*")) { // starts with number
-            return "N" + enumName;
+            return escapeReservedWord(enumName);
         } else {
             return enumName;
         }
@@ -502,7 +512,10 @@ public class CLibcurlClientCodegen extends DefaultCodegen implements CodegenConf
 
     @Override
     public String toModelImport(String name) {
-        return "#include \"" +"../model/" + name + ".h\"";
+        if (importMapping.containsKey(name)) {
+            return "#include \"" +"../model/" + importMapping.get(name) + ".h\"";
+        } else
+            return "#include \"" +"../model/" + name + ".h\"";
     }
 
     @Override
@@ -595,6 +608,18 @@ public class CLibcurlClientCodegen extends DefaultCodegen implements CodegenConf
         return input.replace("=end", "=_end").replace("=begin", "=_begin");
     }
 
+    @Override
+    public CodegenProperty fromProperty(String name, Schema p) {
+        CodegenProperty cm = super.fromProperty(name,p);
+        Schema ref = ModelUtils.getReferencedSchema(openAPI, p);
+        if (ref != null) {
+           if (ref.getEnum() != null) {
+               cm.isEnum = true;
+           }
+        }
+        return cm;
+    }
+
 
     @Override
     public void postProcessFile(File file, String fileType) {

modules/openapi-generator/src/main/resources/C-libcurl/README.md.mustache

@@ -40,6 +40,7 @@ sudo make install
 ```
 
 ## Compile the sample:
+This will compile the generated code and create a library in build folder which has to be linked to the codes where API will be used.
 ```bash
 mkdir build
 cd build
@@ -51,15 +52,17 @@ make
 sudo make install
 ```
 ## How to use compiled library
-Considering the test/source code which uses the API is written in main.c(respective api include is written and all objects necessary are defined)
+Considering the test/source code which uses the API is written in main.c(respective api include is written and all objects necessary are defined and created)
 
-To compile main.c use following command
+To compile main.c(considering the file is present in build folder) use following command
 -L - locaiton of the library(not required if cmake with normal installation is performed)
 -l library name
 ```bash
 gcc main.c -L. -lpetstore -o main
 ```
+once compile, you can run it with ``` ./main ```
 
+Note: You dont need to specify includes for models and include folder seperately as they are path linked. You just have to import the api.h file in your code, the include linking will work.
 
 ## Author
 

modules/openapi-generator/src/main/resources/C-libcurl/object-body.mustache

@@ -0,0 +1,31 @@
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include "object.h"
+
+object_t *object_create() {
+    object_t *object = malloc(sizeof(object_t));
+
+    return object;
+}
+
+void object_free(object_t *object) {
+    free (object);
+}
+
+cJSON *object_convertToJSON(object_t *object) {
+    cJSON *item = cJSON_CreateObject();
+
+    return item;
+fail:
+    cJSON_Delete(item);
+    return NULL;
+}
+
+object_t *object_parseFromJSON(char *jsonString){
+    object_t *object = NULL;
+
+    return object;
+end:
+    return NULL;
+}

modules/openapi-generator/src/main/resources/C-libcurl/object-header.mustache

@@ -0,0 +1,26 @@
+/*
+ * object.h
+ */
+
+#ifndef _object_H_
+#define _object_H_
+
+#include <string.h>
+#include "../external/cJSON.h"
+#include "../include/list.h"
+#include "../include/keyValuePair.h"
+
+
+typedef struct object_t {
+    void *temporary;
+} object_t;
+
+object_t *object_create();
+
+void object_free(object_t *object);
+
+object_t *object_parseFromJSON(char *jsonString);
+
+cJSON *object_convertToJSON(object_t *object);
+
+#endif /* _object_H_ */