TEACL is a fork of TECOC created for the purpose of describing diffs in a document being collaboratively edited
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

46 lines
2.0 KiB

This function "makes room" in a q-register text area for new text.
If the text area was empty, this function simply calls ZAlloc to allocate
new memory. If the text area was not empty, this function calls ZRaloc to
add more memory to the text area. In either case, the Amount argument
specifies how much memory to add to the existing text area.
On entry, QR->Start points to the start of the text area (or NULL if
the text area was empty) and QR->End_P1 points to the end of the text area.
On return, QR->Start points to the start of the text area and QR->End_P1
points to the BEGINNING of the newly allocated memory. This is because the
caller knows where the end is and is expected to reset QR->End_P1 after it
is used as the destination of the new text.
Note: the Amount argument is assumed to be greater than 0.
#include "zport.h" /* define portability identifiers */
#include "tecoc.h" /* define general identifiers */
#include "defext.h" /* define external global variables */
#include "deferr.h" /* define identifiers for error messages */
DEFAULT MakRom(Amount) /* make room in q-register */
SIZE_T Amount; /* how much additional room to make */
ptrdiff_t OldSiz; /* old size of text area */
charptr NewBlk; /* new text area */
static char *DbgFNm = "MakRom";
sprintf(DbgSBf,"Amount = %ld bytes", (LONG)Amount);
if (QR->Start == NULL) { /* if it was empty */
OldSiz = 0;
NewBlk = (charptr)ZAlloc(Amount);
} else {
OldSiz = QR->End_P1 - QR->Start;
NewBlk = (charptr)ZRaloc(QR->Start, OldSiz + Amount);
if (NewBlk == NULL) { /* if ZAlloc/ZRaloc failed */
ErrMsg(ERR_MEM); /* ERR = memory overflow */
return FAILURE;
QR->Start = NewBlk;
QR->End_P1 = NewBlk + OldSiz;
return SUCCESS;