95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
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/* manexamp.c -- The examples which appear in the documentation are here. */
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#include <stdio.h>
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#include <readline/readline.h>
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/* **************************************************************** */
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/* */
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* How to Emulate gets () */
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/* */
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/* **************************************************************** */
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/* A static variable for holding the line. */
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static char *line_read = (char *)NULL;
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/* Read a string, and return a pointer to it. Returns NULL on EOF. */
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char *
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rl_gets ()
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{
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/* If the buffer has already been allocated, return the memory
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to the free pool. */
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if (line_read)
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{
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free (line_read);
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line_read = (char *)NULL;
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}
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/* Get a line from the user. */
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line_read = readline ("");
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/* If the line has any text in it, save it on the history. */
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if (line_read && *line_read)
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add_history (line_read);
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return (line_read);
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}
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/* **************************************************************** */
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/* */
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/* Writing a Function to be Called by Readline. */
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/* */
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/* **************************************************************** */
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/* Invert the case of the COUNT following characters. */
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invert_case_line (count, key)
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int count, key;
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{
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register int start, end;
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start = rl_point;
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if (count < 0)
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{
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direction = -1;
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count = -count;
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}
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else
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direction = 1;
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/* Find the end of the range to modify. */
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end = start + (count * direction);
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/* Force it to be within range. */
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if (end > rl_end)
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end = rl_end;
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else if (end < 0)
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end = -1;
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if (start > end)
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{
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int temp = start;
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start = end;
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end = temp;
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}
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if (start == end)
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return;
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/* Tell readline that we are modifying the line, so save the undo
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information. */
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rl_modifying (start, end);
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for (; start != end; start += direction)
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{
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if (uppercase_p (rl_line_buffer[start]))
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rl_line_buffer[start] = to_lower (rl_line_buffer[start]);
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else if (lowercase_p (rl_line_buffer[start]))
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rl_line_buffer[start] = to_upper (rl_line_buffer[start]);
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}
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/* Move point to on top of the last character changed. */
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rl_point = end - direction;
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}
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