Практика 7

expat.c

#include <stdio.h>
#include <stddef.h>
#include <expat.h>

#define UNUSED(x) (void)(x)

#ifdef XML_UNICODE_WCHAR_T
#  include <wchar.h>
#  define XML_FMT_STR "ls"
#else
#  define XML_FMT_STR "s"
#endif

void XMLCALL start_element(void* user_data, const XML_Char* name, const XML_Char **atts) {
    UNUSED(atts);
    int* depth = (int*)user_data;
    for (int i = 0; i < *depth; i++) {
        printf("  ");
    }
    char *f = XML_FMT_STR;
    printf("%" XML_FMT_STR "\n", name);
}

void XMLCALL end_element(void *user_data, const XML_Char* name) {
    UNUSED(name);
    int* depth = (int*)user_data;
    (*depth)--;
}

const int BUF_SIZE = 179;

int main() {
    int ret = 0;
    FILE* input = fopen("input.xml", "r");
    if (input == NULL) {
        fprintf(stderr, "Failed to open input file\n");
        ret = 1;
        goto ret;
    }

    XML_Parser parser = XML_ParserCreate(NULL);
    char buf[BUF_SIZE];
    int done = 0;
    int depth = 0;

    XML_SetUserData(parser, &depth);
    XML_SetElementHandler(parser, start_element, end_element);
    while (!done) {
        size_t len = fread(buf, 1, sizeof(buf), input);
        done = len < sizeof(buf);
        if (XML_Parse(parser, buf, len, done) == XML_STATUS_ERROR) {
            fprintf(stderr, "XML error\n");
            ret = 1;
            goto free_parser;
        }
    }

  free_parser:
    XML_ParserFree(parser);
  close_file:
    fclose(input);
  ret:
    return ret;
}