Путеводитель по Руководству Linux

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   scanf    ( 3 )

преобразование входного формата (input format conversion)

  Name  |  Synopsis  |  Description  |  Return value  |  Error  |  Attributes  |  Conforming to  |  Note  |  Bugs  |    Examples    |  See also  |

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.