diff options
| -rw-r--r-- | main.c | 13 |
1 files changed, 9 insertions, 4 deletions
@@ -1,5 +1,6 @@ #include <stdio.h> #include <unistd.h> +#include <fcntl.h> #include "agenda_entry.h" #define BS 100 //blocksize for buffers @@ -10,13 +11,14 @@ void destroy_entry_array(entry *array, int elements) { } char *read_file_to_buffer(char *filename) { - FILE *fd = fopen(filename, "r"); + int fd = open(filename, O_RDONLY); + if (fd < 0) return NULL; // if error opening file, return NULLptr int bufsize = BS, bufread = 0; char *buf = (char *)malloc(bufsize); char *newbuf; - while (fread(buf + bufread, 1, 100, fd) == BS) { + while (read(fd, buf + bufread, 100) == BS) { newbuf = (char *)malloc(bufsize + BS); strncpy(newbuf, buf, bufsize); free(buf); @@ -24,11 +26,10 @@ char *read_file_to_buffer(char *filename) { bufsize += BS; bufread += BS; } - fclose(fd); + close(fd); return buf; } -// this function does not work... to debug! entry *read_entries_to_array(char *buffer, int *entries) { int numentries = 5, idx = 0; @@ -60,6 +61,10 @@ int main(int argc, char **argv) { // read file into buf char *buf = read_file_to_buffer(argv[1]); + if (!buf){ // abort if file could not be opened + fprintf(stderr, "Error: file \"%s\" does not exist!\n", argv[1]); + return -1; + } if (strlen(buf) == 0) return -1; // don't do empty buffers // read entries into array |