diff options
Diffstat (limited to 'usr/src/lib/libpp/common/ppcontext.c')
| -rw-r--r-- | usr/src/lib/libpp/common/ppcontext.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/usr/src/lib/libpp/common/ppcontext.c b/usr/src/lib/libpp/common/ppcontext.c new file mode 100644 index 0000000000..220481ab87 --- /dev/null +++ b/usr/src/lib/libpp/common/ppcontext.c @@ -0,0 +1,65 @@ +/*********************************************************************** +* * +* This software is part of the ast package * +* Copyright (c) 1986-2007 AT&T Knowledge Ventures * +* and is licensed under the * +* Common Public License, Version 1.0 * +* by AT&T Knowledge Ventures * +* * +* A copy of the License is available at * +* http://www.opensource.org/licenses/cpl1.0.txt * +* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * +* * +* Information and Software Systems Research * +* AT&T Research * +* Florham Park NJ * +* * +* Glenn Fowler <gsf@research.att.com> * +* * +***********************************************************************/ +#pragma prototyped +/* + * Glenn Fowler + * AT&T Research + * + * preprocessor context switch + * + * args op return + * (0,0) free current context 0 + * (0,1) save current context current + * (p,0) free context p 0 + * (p,1) make p current context previous + */ + +#include "pplib.h" + +void* +ppcontext(void* context, int flags) +{ + struct ppcontext* np = (struct ppcontext*)context; + struct ppcontext* op; + + if (flags & 01) + { + if (!(op = pp.context)) op = pp.context = newof(0, struct ppcontext, 1, 0); + memcpy(op, _PP_CONTEXT_BASE_, sizeof(struct ppcontext)); + } + else + { + if (!(op = np)) op = (struct ppcontext*)_PP_CONTEXT_BASE_; + if (op->filtab) hashfree(op->filtab); + if (op->prdtab) hashfree(op->prdtab); + if (op->symtab) hashfree(op->symtab); + if (op->date) free(op->date); + if (op->time) free(op->time); + if (np) + { + free(np); + np = 0; + } + memzero(op, sizeof(struct ppcontext)); + op = 0; + } + if (np) memcpy(_PP_CONTEXT_BASE_, np, sizeof(struct ppcontext)); + return((void*)op); +} |