editstring.h

Go to the documentation of this file.

#ifndef _IPXE_EDITSTRING_H
#define _IPXE_EDITSTRING_H
 
/** @file
 *
 * Editable strings
 *
 */
 
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
FILE_SECBOOT ( PERMITTED );
 
/** An editable string */
struct edit_string {
        /** Dynamically allocated string buffer */
        char **buf;
        /** Cursor position */
        unsigned int cursor;
 
        /* The following items are the edit history */
 
        /** Last cursor position */
        unsigned int last_cursor;
        /** Start of modified portion of string */
        unsigned int mod_start;
        /** End of modified portion of string */
        unsigned int mod_end;
};
 
/**
 * Initialise editable string
 *
 * @v string            Editable string
 * @v buf               Dynamically allocated string buffer
 *
 * The @c buf parameter must be the address of a caller-provided
 * pointer to a NUL-terminated string allocated using malloc() (or
 * equivalent, such as strdup()).  Any edits made to the string will
 * realloc() the string buffer as needed.
 *
 * The caller may choose leave the initial string buffer pointer as @c
 * NULL, in which case it will be allocated upon the first attempt to
 * insert a character into the buffer.  If the caller does this, then
 * it must be prepared to find the pointer still @c NULL after
 * editing, since the user may never attempt to insert any characters.
 */
static inline __nonnull void init_editstring ( struct edit_string *string,
                                               char **buf ) {
 
        string->buf = buf;
}
 
extern __attribute__ (( nonnull ( 1 ) )) int
replace_string ( struct edit_string *string, const char *replacement );
 
extern __nonnull int edit_string ( struct edit_string *string, int key );
 
#endif /* _IPXE_EDITSTRING_H */