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Revise line primitives lalloc() and lnewline().

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This commit is contained in:
Renaud 2021-08-22 10:51:46 +08:00
parent ab34471d4d
commit bfb78e5382
2 changed files with 49 additions and 61 deletions
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96
line.c
View File

@ -172,8 +172,8 @@ BBINDABLE( forwchar) {
return TRUE ;
}
/*
* This routine allocates a block of memory large enough to hold a struct line
/* This routine allocates a block of memory large enough to hold a struct line
* containing "used" characters. The block is always rounded up a bit. Return
* a pointer to the new block, or NULL if there isn't any memory left. Print a
* message in the message line if no space.
@ -181,13 +181,13 @@ BBINDABLE( forwchar) {
line_p lalloc( int used) {
#define BLOCK_SIZE 16 /* Line block chunk size. */
/* rounding down use masking instead or modulo when BLOCK_SIZE is power of 2 */
/* rounding down use masking instead of modulo when BLOCK_SIZE is power of 2 */
#if (BLOCK_SIZE & -BLOCK_SIZE) == BLOCK_SIZE
int size = (used + BLOCK_SIZE) & ~(BLOCK_SIZE - 1) ;
#else
int size = used + BLOCK_SIZE - used % BLOCK_SIZE ;
#endif
line_p lp = (line_p) malloc( offsetof( struct line, l_text) + size) ;
line_p lp = malloc( sizeof *lp + size) ;
if( lp == NULL)
mloutstr( "(OUT OF MEMORY)") ;
else {
@ -289,8 +289,7 @@ int linstr( char *instr) {
unicode_t tmpc ;
while( (tmpc = *instr++ & 0xFF)) {
status =
(tmpc == '\n' ? lnewline() : (int) linsert_byte( 1, tmpc)) ;
status = (tmpc == '\n') ? lnewline() : linsert_byte( 1, tmpc) ;
/* Insertion error? */
if( status != TRUE) {
@ -393,7 +392,7 @@ boolean linsert_byte( int n, int c) {
return TRUE;
}
int linsert( int n, unicode_t c) {
boolean linsert( int n, unicode_t c) {
assert( n >= 0) ;
assert( !(curbp->b_mode & MDVIEW)) ;
@ -421,7 +420,7 @@ int linsert( int n, unicode_t c) {
*
* int c ; character to overwrite on current position
*/
static int lowrite( int c) {
static boolean lowrite( int c) {
if( curwp->w_doto < curwp->w_dotp->l_used
&& ( lgetc( curwp->w_dotp, curwp->w_doto) != '\t'
|| (curwp->w_doto % tabwidth) == (tabwidth - 1)
@ -431,9 +430,8 @@ static int lowrite( int c) {
return linsert( 1, c) ;
}
/*
* lover -- Overwrite a string at the current point
*/
/* lover -- Overwrite a string at the current point */
int lover( char *ostr) {
int status = TRUE ;
@ -444,7 +442,7 @@ int lover( char *ostr) {
status = (tmpc == '\n' ? lnewline() : lowrite( tmpc)) ;
if( status != TRUE) { /* Insertion error? */
mloutstr( "%Out of memory while overwriting") ;
return status ;
break ;
}
}
}
@ -452,21 +450,15 @@ int lover( char *ostr) {
return status ;
}
/*
* Insert a newline into the buffer at the current location of dot in the
* current window. The funny ass-backwards way it does things is not a botch;
* it just makes the last line in the file not a special case. Return TRUE if
* everything works out and FALSE on error (memory allocation failure). The
* update of dot and mark is a bit easier then in the above case, because the
* split forces more updating.
*/
int lnewline( void) {
char *cp1;
char *cp2;
line_p lp1, lp2 ;
int doto;
struct window *wp;
/* Insert a newline into the buffer at the current location of dot in the
current window. The funny ass-backwards way it does things is not a
botch; it just makes the last line in the file not a special case.
Return TRUE if everything works out and FALSE on error (memory
allocation failure). The update of dot and mark is a bit easier then in
the above case, because the split forces more updating.
*/
boolean lnewline( void) {
assert( !(curbp->b_mode & MDVIEW)) ;
#if SCROLLCODE
@ -474,43 +466,39 @@ int lnewline( void) {
#else
lchange(WFHARD);
#endif
lp1 = curwp->w_dotp; /* Get the address and */
doto = curwp->w_doto; /* offset of "." */
lp2 = lalloc( doto) ; /* New first half line */
line_p lp1 = curwp->w_dotp ; /* Get the address and */
int doto = curwp->w_doto ; /* offset of "." */
line_p lp2 = lalloc( doto) ; /* New first half line */
if( lp2 == NULL)
return FALSE ;
cp1 = &lp1->l_text[0]; /* Shuffle text around */
cp2 = &lp2->l_text[0];
while (cp1 != &lp1->l_text[doto])
*cp2++ = *cp1++;
cp2 = &lp1->l_text[0];
while (cp1 != &lp1->l_text[lp1->l_used])
*cp2++ = *cp1++;
lp1->l_used -= doto;
lp2->l_bp = lp1->l_bp;
lp1->l_bp = lp2;
lp2->l_bp->l_fp = lp2;
lp2->l_fp = lp1;
wp = wheadp; /* Windows */
while (wp != NULL) {
if (wp->w_linep == lp1)
wp->w_linep = lp2;
if (wp->w_dotp == lp1) {
if (wp->w_doto < doto)
wp->w_dotp = lp2;
memcpy( lp2->l_text, lp1->l_text, doto) ;
lp1->l_used -= doto ;
memcpy( lp1->l_text, &lp1->l_text[ doto], lp1->l_used) ;
lp2->l_fp = lp1 ;
lp2->l_bp = lp1->l_bp ;
lp1->l_bp = lp2 ;
lp2->l_bp->l_fp = lp2 ;
for( window_p wp = wheadp ; wp != NULL ; wp = wp->w_wndp) {
if( wp->w_linep == lp1)
wp->w_linep = lp2 ;
if( wp->w_dotp == lp1) {
if( wp->w_doto < doto)
wp->w_dotp = lp2 ;
else
wp->w_doto -= doto;
wp->w_doto -= doto ;
}
if (wp->w_markp == lp1) {
if (wp->w_marko < doto)
wp->w_markp = lp2;
if( wp->w_marko < doto)
wp->w_markp = lp2 ;
else
wp->w_marko -= doto;
wp->w_marko -= doto ;
}
wp = wp->w_wndp;
}
return TRUE;
return TRUE ;
}

14
line.h
View File

@ -14,11 +14,11 @@
list of marks into the line.
*/
typedef struct line {
struct line *l_fp ; /* Forward link to the next line */
struct line *l_bp ; /* Backward link to the previous line */
int l_size ; /* Allocated size */
int l_used ; /* Used size */
char l_text[ 1] ; /* A bunch of characters */
struct line *l_fp ; /* Forward link to the next line */
struct line *l_bp ; /* Backward link to the previous line */
int l_size ; /* Allocated size */
int l_used ; /* Used size */
char l_text[] ; /* A bunch of characters */
} *line_p ;
#define lforw(lp) ((lp)->l_fp)
@ -40,10 +40,10 @@ BBINDABLE( forwchar) ;
void lfree( line_p lp) ;
void lchange( int flag) ;
int linstr( char *instr) ;
int linsert( int n, unicode_t c) ;
boolean linsert( int n, unicode_t c) ;
boolean linsert_byte( int n, int c) ;
int lover( char *ostr) ;
int lnewline( void) ;
boolean lnewline( void) ;
boolean ldelete( long n, boolean kflag) ;
boolean ldelchar( long n, boolean kflag) ;
int lgetchar( unicode_t *cref) ;