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include "../curses.h"
include "linefn.h"
# LINEFN -- Function that processes a line of input in a window
procedure linefn (win, ch, maxch, str, data, done)
int win # i: Window descriptor
int ch # i: Keyboard character
int maxch # i: Maximum line length
char str[ARB] # io: String containing line
pointer data # io: Line data structure
bool done # o: Flag indicating line is done
#--
int ic, jc, nc
int strlen()
begin
done = false
if (LIN_ROW(data) == 0 || LIN_COL(data) == 0)
call getyx (win, LIN_ROW(data), LIN_COL(data))
if (ch < K_BASE) {
LIN_ICHAR(data) = LIN_ICHAR(data) + 1
LIN_COL(data) = LIN_COL(data) + 1
ic = LIN_ICHAR(data)
if (str[ic] == EOS) {
if (ic > maxch) {
done = true
LIN_LAST(data) = EOS
} else {
str[ic] = ch
str[ic+1] = EOS
call waddstr (win, str[ic])
}
} else {
nc = strlen (str)
if (nc >= maxch) {
done = true
LIN_LAST(data) = EOS
} else {
do jc = nc+1, ic, -1
str[jc+1] = str[jc]
str[ic] = ch
call winsch (win, str[ic])
}
}
if (ch == '\r') {
done = true
LIN_LAST(data) = '\n'
}
} else {
ic = LIN_ICHAR(data)
switch (ch) {
case K_RIGHT: # Move right one column
if (str[ic] == EOS) {
done = true
LIN_LAST(data) = EOS
} else {
LIN_ICHAR(data) = LIN_ICHAR(data) + 1
LIN_COL(data) = LIN_COL(data) + 1
call wmove (win, LIN_ROW(data), LIN_COL(data))
}
case K_LEFT: # Move left one column
if (ic == 1) {
done = true
LIN_LAST(data) = EOS
} else {
LIN_ICHAR(data) = LIN_ICHAR(data) - 1
LIN_COL(data) = LIN_COL(data) - 1
call wmove (win, LIN_ROW(data), LIN_COL(data))
}
case K_BOL: # Move to first column in line
if (ic > 1) {
LIN_ICHAR(data) = 1
LIN_COL(data) = LIN_COL(data) - ic + 1
call wmove (win, LIN_ROW(data), LIN_COL(data))
}
case K_EOL: # Move to last column in line
if (str[ic] != EOS) {
LIN_ICHAR(data) = strlen (str) + 1
LIN_COL(data) = LIN_COL(data) + LIN_ICHAR(data) - ic
call wmove (win, LIN_ROW(data), LIN_COL(data))
}
case K_DEL: # Delete character underneath cursor
if (str[ic] != EOS) {
while (str[ic] != EOS) {
str[ic] = str[ic+1]
ic = ic + 1
}
call wdelch (win)
}
case K_BS: # Delete character to left of cursor
if (ic > 1) {
LIN_ICHAR(data) = LIN_ICHAR(data) - 1
LIN_COL(data) = LIN_COL(data) - 1
ic = ic - 1
while (str[ic] != EOS) {
str[ic] = str[ic+1]
ic = ic + 1
}
call wmove (win, LIN_ROW(data), LIN_COL(data))
call wdelch (win)
}
case K_DWORD: # Delete entire line
if (str[1] != EOS) {
LIN_ICHAR(data) = 1
LIN_COL(data) = LIN_COL(data) - ic + 1
for (ic = 1; str[ic] != EOS; ic = ic + 1)
str[ic] = ' '
call addstr (win, str)
str[1] = EOS
}
default:
done = true
LIN_LAST(data) = ch
}
}
end
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