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ncplane_at_yx_cell/at_cursor_cell: return bytes of egc

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nick black 2020-12-18 19:11:05 -05:00
parent fd146db050
commit 0b633fbdad
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2 changed files with 9 additions and 4 deletions
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9
include/notcurses/notcurses.h
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@ -621,7 +621,8 @@ cell_prime(struct ncplane* n, nccell* c, const char* gcluster,
return ret;
}
// Duplicate 'c' into 'targ'; both must be/will be bound to 'n'.
// Duplicate 'c' into 'targ'; both must be/will be bound to 'n'. Returns -1 on
// failure, and 0 on success.
API int cell_duplicate(struct ncplane* n, nccell* targ, const nccell* c);
// Release resources held by the nccell 'c'.
@ -1335,7 +1336,8 @@ API int ncplane_rotate_ccw(struct ncplane* n);
API char* ncplane_at_cursor(struct ncplane* n, uint16_t* stylemask, uint64_t* channels);
// Retrieve the current contents of the cell under the cursor into 'c'. This
// cell is invalidated if the associated plane is destroyed.
// cell is invalidated if the associated plane is destroyed. Returns the number
// of bytes in the EGC, or -1 on error.
API int ncplane_at_cursor_cell(struct ncplane* n, nccell* c);
// Retrieve the current contents of the specified cell. The EGC is returned, or
@ -1345,7 +1347,8 @@ API char* ncplane_at_yx(const struct ncplane* n, int y, int x,
uint16_t* stylemask, uint64_t* channels);
// Retrieve the current contents of the specified cell into 'c'. This cell is
// invalidated if the associated plane is destroyed.
// invalidated if the associated plane is destroyed. Returns the number of
// bytes in the EGC, or -1 on error.
API int ncplane_at_yx_cell(struct ncplane* n, int y, int x, nccell* c);
// Create a flat string from the EGCs of the selected region of the ncplane

4
src/lib/notcurses.c
View File

@ -239,7 +239,9 @@ int ncplane_at_yx_cell(ncplane* n, int y, int x, nccell* c){
if(y < n->leny && x < n->lenx){
if(y >= 0 && x >= 0){
nccell* targ = ncplane_cell_ref_yx(n, y, x);
return cell_duplicate(n, c, targ);
if(cell_duplicate(n, c, targ) == 0){
return strlen(cell_extended_gcluster(n, targ));
}
}
}
return -1;