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Fix some misuses of strncat().

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This commit is contained in:
Tom Lane
2006-09-27 16:19:42 +00:00
parent 9ba4065312
commit 1d45168f4b
3 changed files with 14 additions and 12 deletions
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11
src/tutorial/funcs.c
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@ -1,4 +1,4 @@
/* $PostgreSQL: pgsql/src/tutorial/funcs.c,v 1.15 2006/05/31 20:58:09 tgl Exp $ */
/* $PostgreSQL: pgsql/src/tutorial/funcs.c,v 1.16 2006/09/27 16:19:42 tgl Exp $ */
/******************************************************************************
These are user-defined functions that can be bound to a Postgres backend
@ -85,13 +85,14 @@ copytext(text *t)
text *
concat_text(text *arg1, text *arg2)
{
int32 new_text_size = VARSIZE(arg1) + VARSIZE(arg2) - VARHDRSZ;
int32 arg1_size = VARSIZE(arg1) - VARHDRSZ;
int32 arg2_size = VARSIZE(arg2) - VARHDRSZ;
int32 new_text_size = arg1_size + arg2_size + VARHDRSZ;
text *new_text = (text *) palloc(new_text_size);
memset((void *) new_text, 0, new_text_size);
VARATT_SIZEP(new_text) = new_text_size;
strncpy(VARDATA(new_text), VARDATA(arg1), VARSIZE(arg1) - VARHDRSZ);
strncat(VARDATA(new_text), VARDATA(arg2), VARSIZE(arg2) - VARHDRSZ);
memcpy(VARDATA(new_text), VARDATA(arg1), arg1_size);
memcpy(VARDATA(new_text) + arg1_size, VARDATA(arg2), arg2_size);
return new_text;
}