[C] chek cpu endian

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#include <stdint.h> static uint8_t is_little_endian(void) { uint16_t value = 0x0001; uint8_t *byte_ptr = (uint8_t *)&value; return (*byte_ptr == 0x01); // If the system is little endian, the least significant byte is 0x01. }

[C] Create a folder even if the parent folder does not exist.

 

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static int my_dirname(char *path) { char *p = strrchr(path, '/'); if (p == NULL || p == path) { return -1; } *p = '\0'; return 0; } static int my_mkdir(char *path) { struct stat st; char p[128]; char l[128]; mkdir(path, 0775); while ((stat(path, &st) != 0)) { memset(p, 0, 128); memcpy(p, path, strlen(path)); if (0 != my_dirname(p)) { return (-1); } while ((stat(p, &st) != 0)) { memset(l, 0, 128); memcpy(l, p, strlen(p)); // save the last not exist parent path. if (0 != my_dirname(p)) { return (-1); } } mkdir(l, 0775); if (stat(l, &st) != 0) { return (-1); } mkdir(path, 0775); } return (0); }