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   scanf    ( 3 )

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Примеры (Examples)

To use the dynamic allocation conversion specifier, specify m as
       a length modifier (thus %ms or %m[range]).  The caller must
       free(3) the returned string, as in the following example:

           char *p;
           int n;

           errno = 0;
           n = scanf("%m[a-z]", &p);
           if (n == 1) {
               printf("read: %s\n", p);
               free(p);
           } else if (errno != 0) {
               perror("scanf");
           } else {
               fprintf(stderr, "No matching characters\n");
           }

       As shown in the above example, it is necessary to call free(3)
       only if the scanf() call successfully read a string.