There is a main () function in it, the function file (file_name) is called with the address on the file that needs to be read into the array and returned to the variable in main (I sit in ubuntu 13.10 writing in NetBeans 7.4)

#include <arpa/inet.h> #include <netinet/in.h> #include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <sys/ioctl.h> #include <netinet/in.h> #include <net/if.h> #include <unistd.h> #include <stdlib.h> #include <string.h> char *file(const char *config_file) { FILE *fp = fopen(config_file, "r"); char line[1024]; char *ip_address[1024] = {}; char ch = getc(fp); int index = 0; int i = 0, i2 = 0; while (ch != EOF) { if (ch != '\n') { line[index++] = ch; } else { line[index] = '\0'; index = 0; ip_address[i] = malloc(strlen(line) * sizeof (char)); strcpy(ip_address[i], line); i++; } ch = getc(fp); } fclose(fp); return ip_address; } int main(int argc, char *argv[]) { int opt = 0, i; char *in_fname = NULL; char count = 0; while ((opt = getopt(argc, argv, "f:")) != -1) { switch (opt) { case 'f': in_fname = optarg; char *buff = file(in_fname); for (count = 0; count < 12; count++) { printf("%s", buff[count]); } case '?': if (optopt == 'f') { printf("Вы не выбрали файл\n"); } break; } } return 0; }

I'm trying to run like this

 ./app -f 'text.txt'

The contents of the text.txt file are just strings in "\ n", but in main () I want to get them without "\ n"

    1 answer 1

    @Negash , firstly, you need to return not char * but char ** (similar to the argv [] parameter in main),

    secondly, the memory for the returned array of pointers should also be allocated malloc-ohm,

    and third, read the lines and trim '\n' IMHO is more convenient because

     char **ip_address = malloc(sizeof(*ip_address) * (LIMIT + 1)); char str[LINE_MAX]; while (i < LIMIT && fgets(str, sizeof(str), infile)) { int l = strlen(str); str[l > 0 ? l - 1 : l] = 0; ip_address[i++] = strdup(str); } ip_address[i] = 0; // так можно будет узнать размер этого массива ... места мало...

    UPD

    I decided to convert to the answer and add a little. Linuke (GNU) has a good function, getline() . With it, the function of reading lines becomes better.

     avp@avp-xub11:~/hashcode$ ./a.out filelines.c test get_filelines(filelines.c) #include <stdio.h> #include <stdlib.h> #include <errno.h> #define START_INCR 64 #define LIMIT_INCR 1024 char ** get_filelines (const char *filename) { FILE *in = filename ? fopen(filename, "r") : stdin; if (!in) // can't open (see errno) return 0; char **res = 0, *str = 0; size_t rsx = 0, capacity = 0, incr = START_INCR, strsz, i; ssize_t lstr; while ((lstr = getline(&str, &strsz, in)) >= 0) { if (rsx + 2 > capacity) { // increase res[] if need it if (!(res = (typeof(res))realloc(res, (capacity += incr) * sizeof(*res)))) return 0; // no memory (see errno) if ((incr <<= 1) > LIMIT_INCR) incr = LIMIT_INCR; } if (lstr) str[lstr - 1] = 0; // del '\n' res[rsx++] = str; str = 0; } if (in != stdin) fclose(in); if (res) { res[rsx++] = 0; // terminate lines list by NULL res = (char **)realloc(res, rsx * sizeof(*res)); } else { errno = 0; // empty file } return res; } int main (int ac, char *av[]) { printf ("test get_filelines(%s)\n", av[1] ? av[1] : "stdin"); char **flines = get_filelines(av[1]); if (!flines) perror("get_filelines"); else while (*flines) puts(*flines++); return !flines; } avp@avp-xub11:~/hashcode$

    This is her file with her code prints.