merge.c

File merge full example.

#include "tools.h"
 
void print_merge_help() {
    printf("Usage: merge -s [source file] -d [destination file] -f [array of merged files]");
}
 
int process_merge(int argc, char *argv[]) {
    const int MERGE_FILES_START_INDEX = 5;
 
    const char *source_file = NULL;
    const char *destination_file = NULL;
    int merge_files_count = 0;
 
    DocumentHandle* document = NULL;
 
    integer_type i = 0;
 
    if (argc < 6) {
        print_merge_help();
        return VANILLAPDF_TOOLS_ERROR_INVALID_PARAMETERS;
    }
 
    if (0 != strcmp(argv[0], "-s")) {
        print_merge_help();
        return VANILLAPDF_TOOLS_ERROR_INVALID_PARAMETERS;
    }
 
    if (0 != strcmp(argv[2], "-d")) {
        print_merge_help();
        return VANILLAPDF_TOOLS_ERROR_INVALID_PARAMETERS;
    }
 
    if (0 != strcmp(argv[4], "-f")) {
        print_merge_help();
        return VANILLAPDF_TOOLS_ERROR_INVALID_PARAMETERS;
    }
 
    source_file = argv[1];
    destination_file = argv[3];
    merge_files_count = argc - MERGE_FILES_START_INDEX;
 
    RETURN_ERROR_IF_NOT_SUCCESS(Document_Open(source_file, &document));
 
    for (i = 0; i < merge_files_count; ++i) {
        DocumentHandle* other_document = NULL;
 
        RETURN_ERROR_IF_NOT_SUCCESS(Document_Open(argv[MERGE_FILES_START_INDEX + i], &other_document));
        RETURN_ERROR_IF_NOT_SUCCESS(Document_AppendDocument(document, other_document));
        RETURN_ERROR_IF_NOT_SUCCESS(Document_Release(other_document));
    }
 
    RETURN_ERROR_IF_NOT_SUCCESS(Document_Save(document, destination_file));
    RETURN_ERROR_IF_NOT_SUCCESS(Document_Release(document));
 
    return VANILLAPDF_TOOLS_ERROR_SUCCESS;
}