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| #include <assert.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <emscripten/emscripten.h> |
|
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| void create_file() { |
| FILE *file = fopen("hello_file.txt", "wb"); |
| assert(file); |
| const char *data = "Hello world"; |
| const char *data2 = "da"; |
| const char *data3 = "ta!"; |
| fwrite(data, 1, strlen(data), file); |
| fseek(file, 8, SEEK_SET); |
| fwrite(data3, 1, strlen(data3), file); |
| fseek(file, 6, SEEK_SET); |
| fwrite(data2, 1, strlen(data2), file); |
| fclose(file); |
| } |
|
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| void read_file() { |
| FILE *file = fopen("hello_file.txt", "rb"); |
| char buffer[128] = {}; |
| size_t read = fread(buffer, 1, sizeof(buffer), file); |
| printf("read %u bytes. Result: %s\n", (unsigned int)read, buffer); |
| assert(read == strlen("Hello data!")); |
| assert(!strcmp(buffer, "Hello data!")); |
| } |
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| int main() { |
| create_file(); |
| read_file(); |
| return 0; |
| } |
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