ReadCode-001: memcpy memset bzero

#include <stdio.h>#include <stdlib.h>#include <string.h>struct student{int age;char name[15];};typedef struct student student_t;int main(void) {student_t stu1, *stu1_ptr;stu1.age = 12;strcpy(stu1.name, "amao");stu1_ptr = &stu1;student_t *stu2_ptr = (student_t *) malloc(sizeof(student_t));memset(stu2_ptr, 0, sizeof(student_t));printf("%d %s\n", stu1_ptr->age, stu1_ptr->name);printf("%d %s\n", stu2_ptr->age, stu2_ptr->name);memcpy(stu2_ptr, stu1_ptr, sizeof(student_t));printf("%d %s\n", stu2_ptr->age, stu2_ptr->name);return EXIT_SUCCESS;}

/* static variables */#ifdef WITH_PTHREADS  static pthread_mutex_t  log_lock = PTHREAD_MUTEX_INITIALIZER;#else  static int              log_lock;#endif /* WITH_PTHREADS *///-----------------------------------#  define slurm_mutex_lock(mutex)#  define slurm_mutex_unlock(mutex)//-----------------------------------/* return the FILE * of the current logfile (stderr if logging to stderr) */FILE *log_fp(void){FILE *fp;slurm_mutex_lock(&log_lock);if (log->logfp)fp = log->logfp;elsefp = stderr;slurm_mutex_unlock(&log_lock);return fp;}//-----------------------------------/* * "Safe" version of malloc(). *   size (IN)number of bytes to malloc *   RETURNpointer to allocate heap space */void *slurm_xmalloc(size_t size, const char *file, int line, const char *func){void *new;int *p;xmalloc_assert(size >= 0 && size <= INT_MAX);MALLOC_LOCK();p = (int *)malloc(size + 2*sizeof(int));MALLOC_UNLOCK();if (!p) {/* don't call log functions here, we're probably OOM */fprintf(log_fp(), "%s:%d: %s: xmalloc(%d) failed\n",file, line, func, (int)size);exit(1);}p[0] = XMALLOC_MAGIC;/* add "secret" magic cookie */p[1] = (int)size;/* store size in buffer */new = &p[2];memset(new, 0, size);return new;}//-----------------------------------#define xmalloc(__sz) \slurm_xmalloc (__sz, __FILE__, __LINE__, __CURRENT_FUNC__)//-----------------------------------extern int jobacct_common_init_struct(struct jobacctinfo *jobacct,      jobacct_id_t *jobacct_id){if (!jobacct_id) {jobacct_id_t temp_id;temp_id.taskid = (uint16_t)NO_VAL;temp_id.nodeid = (uint32_t)NO_VAL;jobacct_id = &temp_id;}memset(jobacct, 0, sizeof(struct jobacctinfo));jobacct->sys_cpu_sec = 0;jobacct->sys_cpu_usec = 0;jobacct->user_cpu_sec = 0;jobacct->user_cpu_usec = 0;jobacct->max_vsize = 0;memcpy(&jobacct->max_vsize_id, jobacct_id, sizeof(jobacct_id_t));jobacct->tot_vsize = 0;jobacct->max_rss = 0;memcpy(&jobacct->max_rss_id, jobacct_id, sizeof(jobacct_id_t));jobacct->tot_rss = 0;jobacct->max_pages = 0;memcpy(&jobacct->max_pages_id, jobacct_id, sizeof(jobacct_id_t));jobacct->tot_pages = 0;jobacct->min_cpu = (uint32_t)NO_VAL;memcpy(&jobacct->min_cpu_id, jobacct_id, sizeof(jobacct_id_t));jobacct->tot_cpu = 0;return SLURM_SUCCESS;}extern struct jobacctinfo *jobacct_common_alloc_jobacct(jobacct_id_t *jobacct_id){struct jobacctinfo *jobacct = xmalloc(sizeof(struct jobacctinfo));jobacct_common_init_struct(jobacct, jobacct_id);return jobacct;}