ref: 4f86a1253940f8f866413a2095ae3b21598d6b6f
dir: /src/asm/fstack.c/
/*
* FileStack routines
*/
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "asm/symbol.h"
#include "asm/fstack.h"
#include "types.h"
#include "asm/main.h"
#include "asm/lexer.h"
#include "extern/err.h"
#include "extern/strl.h"
#ifndef PATH_MAX
#define PATH_MAX 256
#endif
struct sContext *pFileStack;
struct sSymbol *pCurrentMacro;
YY_BUFFER_STATE CurrentFlexHandle;
FILE *pCurrentFile;
ULONG nCurrentStatus;
char tzCurrentFileName[_MAX_PATH + 1];
char IncludePaths[MAXINCPATHS][_MAX_PATH + 1];
SLONG NextIncPath = 0;
ULONG nMacroCount;
char *pCurrentREPTBlock;
ULONG nCurrentREPTBlockSize;
ULONG nCurrentREPTBlockCount;
ULONG ulMacroReturnValue;
/*
* defines for nCurrentStatus
*/
#define STAT_isInclude 0
#define STAT_isMacro 1
#define STAT_isMacroArg 2
#define STAT_isREPTBlock 3
/*
* Context push and pop
*/
void
pushcontext(void)
{
struct sContext **ppFileStack;
ppFileStack = &pFileStack;
while (*ppFileStack)
ppFileStack = &((*ppFileStack)->pNext);
if ((*ppFileStack = malloc(sizeof(struct sContext))) != NULL) {
(*ppFileStack)->FlexHandle = CurrentFlexHandle;
(*ppFileStack)->pNext = NULL;
strcpy((char *) (*ppFileStack)->tzFileName,
(char *) tzCurrentFileName);
(*ppFileStack)->nLine = nLineNo;
switch ((*ppFileStack)->nStatus = nCurrentStatus) {
case STAT_isMacroArg:
case STAT_isMacro:
sym_SaveCurrentMacroArgs((*ppFileStack)->tzMacroArgs);
(*ppFileStack)->pMacro = pCurrentMacro;
break;
case STAT_isInclude:
(*ppFileStack)->pFile = pCurrentFile;
break;
case STAT_isREPTBlock:
sym_SaveCurrentMacroArgs((*ppFileStack)->tzMacroArgs);
(*ppFileStack)->pREPTBlock = pCurrentREPTBlock;
(*ppFileStack)->nREPTBlockSize = nCurrentREPTBlockSize;
(*ppFileStack)->nREPTBlockCount =
nCurrentREPTBlockCount;
break;
}
nLineNo = 0;
} else
fatalerror("No memory for context");
}
int
popcontext(void)
{
struct sContext *pLastFile, **ppLastFile;
if (nCurrentStatus == STAT_isREPTBlock) {
if (--nCurrentREPTBlockCount) {
yy_delete_buffer(CurrentFlexHandle);
CurrentFlexHandle =
yy_scan_bytes(pCurrentREPTBlock,
nCurrentREPTBlockSize);
yy_switch_to_buffer(CurrentFlexHandle);
sym_UseCurrentMacroArgs();
sym_SetMacroArgID(nMacroCount++);
sym_UseNewMacroArgs();
return (0);
}
}
if ((pLastFile = pFileStack) != NULL) {
ppLastFile = &pFileStack;
while (pLastFile->pNext) {
ppLastFile = &(pLastFile->pNext);
pLastFile = *ppLastFile;
}
yy_delete_buffer(CurrentFlexHandle);
nLineNo = pLastFile->nLine;
if (nCurrentStatus == STAT_isInclude)
fclose(pCurrentFile);
if (nCurrentStatus == STAT_isMacro) {
sym_FreeCurrentMacroArgs();
nLineNo += 1;
}
if (nCurrentStatus == STAT_isREPTBlock)
nLineNo += 1;
CurrentFlexHandle = pLastFile->FlexHandle;
strcpy((char *) tzCurrentFileName,
(char *) pLastFile->tzFileName);
switch (nCurrentStatus = pLastFile->nStatus) {
case STAT_isMacroArg:
case STAT_isMacro:
sym_RestoreCurrentMacroArgs(pLastFile->tzMacroArgs);
pCurrentMacro = pLastFile->pMacro;
break;
case STAT_isInclude:
pCurrentFile = pLastFile->pFile;
break;
case STAT_isREPTBlock:
sym_RestoreCurrentMacroArgs(pLastFile->tzMacroArgs);
pCurrentREPTBlock = pLastFile->pREPTBlock;
nCurrentREPTBlockSize = pLastFile->nREPTBlockSize;
nCurrentREPTBlockCount = pLastFile->nREPTBlockCount;
break;
}
free(*ppLastFile);
*ppLastFile = NULL;
yy_switch_to_buffer(CurrentFlexHandle);
return (0);
} else
return (1);
}
int
yywrap(void)
{
return (popcontext());
}
/*
* Dump the context stack to stderr
*/
void
fstk_Dump(void)
{
struct sContext *pLastFile;
pLastFile = pFileStack;
while (pLastFile) {
fprintf(stderr, "%s(%ld) -> ", pLastFile->tzFileName,
pLastFile->nLine);
pLastFile = pLastFile->pNext;
}
fprintf(stderr, "%s(%ld)", tzCurrentFileName, nLineNo);
}
/*
* Extra includepath stuff
*/
void
fstk_AddIncludePath(char *s)
{
if (NextIncPath == MAXINCPATHS) {
fatalerror("Too many include directories passed from command line");
return;
}
if (strlcpy(IncludePaths[NextIncPath++], s, _MAX_PATH) >= _MAX_PATH) {
fatalerror("Include path too long '%s'",s);
return;
}
}
FILE *
fstk_FindFile(char *fname)
{
char path[PATH_MAX];
int i;
FILE *f;
if ((f = fopen(fname, "rb")) != NULL || errno != ENOENT) {
return f;
}
for (i = 0; i < NextIncPath; ++i) {
if (strlcpy(path, IncludePaths[i], sizeof path) >=
sizeof path) {
continue;
}
if (strlcat(path, fname, sizeof path) >= sizeof path) {
continue;
}
if ((f = fopen(path, "rb")) != NULL || errno != ENOENT) {
return f;
}
}
errno = ENOENT;
return NULL;
}
/*
* Set up an include file for parsing
*/
void
fstk_RunInclude(char *tzFileName)
{
FILE *f;
f = fstk_FindFile(tzFileName);
if (f == NULL) {
err(1, "Unable to open included file '%s'",
tzFileName);
}
pushcontext();
nLineNo = 1;
nCurrentStatus = STAT_isInclude;
strcpy(tzCurrentFileName, tzFileName);
pCurrentFile = f;
CurrentFlexHandle = yy_create_buffer(pCurrentFile);
yy_switch_to_buffer(CurrentFlexHandle);
//Dirty hack to give the INCLUDE directive a linefeed
yyunput('\n');
nLineNo -= 1;
}
/*
* Set up a macro for parsing
*/
ULONG
fstk_RunMacro(char *s)
{
struct sSymbol *sym;
if ((sym = sym_FindMacro(s)) != NULL) {
pushcontext();
sym_SetMacroArgID(nMacroCount++);
nLineNo = -1;
sym_UseNewMacroArgs();
nCurrentStatus = STAT_isMacro;
strcpy(tzCurrentFileName, s);
if (sym->pMacro == NULL)
return 0;
pCurrentMacro = sym;
CurrentFlexHandle =
yy_scan_bytes(pCurrentMacro->pMacro,
strlen(pCurrentMacro->pMacro));
yy_switch_to_buffer(CurrentFlexHandle);
return (1);
} else
return (0);
}
/*
* Set up a macroargument for parsing
*/
void
fstk_RunMacroArg(SLONG s)
{
char *sym;
if (s == '@')
s = -1;
else
s -= '0';
if ((sym = sym_FindMacroArg(s)) != NULL) {
pushcontext();
nCurrentStatus = STAT_isMacroArg;
sprintf(tzCurrentFileName, "%c", (UBYTE) s);
CurrentFlexHandle = yy_scan_bytes(sym, strlen(sym));
yy_switch_to_buffer(CurrentFlexHandle);
} else
fatalerror("No such macroargument");
}
/*
* Set up a stringequate for parsing
*/
void
fstk_RunString(char *s)
{
struct sSymbol *pSym;
if ((pSym = sym_FindSymbol(s)) != NULL) {
pushcontext();
nCurrentStatus = STAT_isMacroArg;
strcpy(tzCurrentFileName, s);
CurrentFlexHandle =
yy_scan_bytes(pSym->pMacro, strlen(pSym->pMacro));
yy_switch_to_buffer(CurrentFlexHandle);
} else
yyerror("No such string symbol '%s'", s);
}
/*
* Set up a repeat block for parsing
*/
void
fstk_RunRept(ULONG count)
{
if (count) {
pushcontext();
sym_UseCurrentMacroArgs();
sym_SetMacroArgID(nMacroCount++);
sym_UseNewMacroArgs();
nCurrentREPTBlockCount = count;
nCurrentStatus = STAT_isREPTBlock;
nCurrentREPTBlockSize = ulNewMacroSize;
pCurrentREPTBlock = tzNewMacro;
CurrentFlexHandle =
yy_scan_bytes(pCurrentREPTBlock, nCurrentREPTBlockSize);
yy_switch_to_buffer(CurrentFlexHandle);
}
}
/*
* Initialize the filestack routines
*/
void
fstk_Init(char *s)
{
char tzFileName[_MAX_PATH + 1];
sym_AddString("__FILE__", s);
strcpy(tzFileName, s);
pFileStack = NULL;
pCurrentFile = fopen(tzFileName, "rb");
if (pCurrentFile == NULL) {
err(1, "Unable to open file '%s'", tzFileName);
}
nMacroCount = 0;
nCurrentStatus = STAT_isInclude;
strcpy(tzCurrentFileName, tzFileName);
CurrentFlexHandle = yy_create_buffer(pCurrentFile);
yy_switch_to_buffer(CurrentFlexHandle);
nLineNo = 1;
}