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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include "common.h"
#include "parse.h"
void list_employees(struct dbheader_t *dbhdr, struct employee_t *employees) {
int i = 0;
for (; i < dbhdr->count; i++) {
printf("Employee %d\n", i);
printf("\tName: %s\n", employees[i].name);
printf("\tAddress: %s\n", employees[i].address);
printf("\tHours: %d\n", employees[i].hours);
}
}
int add_employee(struct dbheader_t *dbhdr, struct employee_t *employees, char *addstring) {
printf("%s\n", addstring);
char *name = strtok(addstring, ",");
char *addr = strtok(NULL, ",");
char *hours = strtok(NULL, ",");
printf("%s %s %s\n", name, addr, hours);
strncpy(employees[dbhdr->count-1].name, name, sizeof(employees[dbhdr->count-1].name));
strncpy(employees[dbhdr->count-1].address, addr, sizeof(employees[dbhdr->count-1].address));
employees[dbhdr->count-1].hours = atoi(hours);
return STATUS_SUCCESS;
}
int read_employees(int fd, struct dbheader_t *dbhdr, struct employee_t **employeesOut) {
if (fd < 0) {
printf("Got a bad FD from the user\n");
return STATUS_ERROR;
}
int count = dbhdr->count;
struct employee_t *employees = calloc(count, sizeof(struct employee_t));
if (employees == (void*)-1) {
printf("Malloc failed\n");
return STATUS_ERROR;
}
read(fd, employees, count*sizeof(struct employee_t));
int i = 0;
for (; i < count; i++) {
employees[i].hours = ntohl(employees[i].hours);
}
*employeesOut = employees;
return STATUS_SUCCESS;
}
int output_file(int fd, struct dbheader_t *dbhdr, struct employee_t *employees) {
if (fd < 0) {
printf("Got a bad FD from the user\n");
return STATUS_ERROR;
}
int realcount = dbhdr->count;
dbhdr->magic = htonl(dbhdr->magic);
dbhdr->filesize = htonl(sizeof(struct dbheader_t) + (sizeof(struct employee_t) * realcount));
dbhdr->count = htons(dbhdr->count);
dbhdr->version = htons(dbhdr->version);
lseek(fd, 0, SEEK_SET);
write(fd, dbhdr, sizeof(struct dbheader_t));
int i = 0;
for (; i < realcount; i++) {
employees[i].hours = htonl(employees[i].hours);
write(fd, &employees[i], sizeof(struct employee_t));
}
return STATUS_SUCCESS;
}
int validate_db_header(int fd, struct dbheader_t **headerOut) {
if (fd < 0) {
printf("Got a bad FD from the user\n");
return STATUS_ERROR;
}
struct dbheader_t *header = calloc(1, sizeof(struct dbheader_t));
if (header == (void*)-1) {
printf("Malloc failed create a db header\n");
return STATUS_ERROR;
}
if (read(fd, header, sizeof(struct dbheader_t)) != sizeof(struct dbheader_t)) {
perror("read");
free(header);
return STATUS_ERROR;
}
header->version = ntohs(header->version);
header->count = ntohs(header->count);
header->magic = ntohl(header->magic);
header->filesize = ntohl(header->filesize);
if (header->magic != HEADER_MAGIC) {
printf("Impromper header magic\n");
free(header);
return -1;
}
if (header->version != 1) {
printf("Impromper header version\n");
free(header);
return -1;
}
struct stat dbstat = {0};
fstat(fd, &dbstat);
if (header->filesize != dbstat.st_size) {
printf("Corrupted database\n");
free(header);
return -1;
}
*headerOut = header;
}
int create_db_header(int fd, struct dbheader_t **headerOut) {
struct dbheader_t *header = calloc(1, sizeof(struct dbheader_t));
if (header == (void*)-1) {
printf("Malloc failed to create db header\n");
return STATUS_ERROR;
}
header->version = 0x1;
header->count = 0;
header->magic = HEADER_MAGIC;
header->filesize = sizeof(struct dbheader_t);
*headerOut = header;
return STATUS_SUCCESS;
}
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