123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504 |
- /* readsrc.c - read source files for assembler */
- #include "syshead.h"
- #include "const.h"
- #include "type.h"
- #include "flag.h"
- #include "file.h"
- #include "globvar.h"
- #include "macro.h"
- #include "scan.h"
- #undef EXTERN
- #define EXTERN
- #include "source.h"
- /*
- * Ok, lots of hack & slash here.
- * 1) Added BIG buffer to load entire _primary_ file into memory.
- * 2) This means the primary file can be standard input.
- * 3) Fixed so 'get/include' processing now works.
- * 4) Altered for a 'normal' style buffer otherwise (MINIBUF)
- * 5) Have the option of completely unbuffered if you need the last Kb.
- *
- * RDB.
- */
- #ifndef __AS386_16__
- #ifndef BIGBUFFER
- #define BIGBUFFER 1 /* For most machines we have the memory */
- #endif
- #endif
- #ifdef MSDOS
- #define off_t long /* Not a typedef! */
- #endif
- #ifndef MINIBUF
- #define MINIBUF 1 /* Add in a reasonable buffer */
- #endif
- struct get_s /* to record included files */
- {
- fd_t fd;
- unsigned line;
- off_t position;
- };
- PRIVATE char hid_filnambuf[FILNAMLEN + 1]; /* buffer for file name */
- PRIVATE struct get_s hid_getstak[MAXGET]; /* GET stack */
- PRIVATE struct get_s *getstak; /* ptr */
- #if BIGBUFFER == 1
- PRIVATE char *mem_start = 0, *mem_end;
- #endif
- PRIVATE char hid_linebuf[LINLEN]; /* line buffer */
- PRIVATE char *eol_ptr;
- PRIVATE char *maclinebuf;
- PRIVATE char *maclineptr;
- #if MINIBUF == 1
- PRIVATE void inp_seek P((int fd, long posn));
- PRIVATE long inp_tell P((int fd));
- PRIVATE int inp_line P((int fd, char * buf, int size));
- #endif
- FORWARD void clearsource P((void));
- FORWARD void line_too_long P((void));
- PRIVATE void clearsource()
- {
- }
- PRIVATE void line_too_long()
- {
- symname = linebuf + (LINLEN - 1); /* spot for the error */
- error(LINLONG); /* so error is shown in column LINLEN - 1 */
- }
- /* initialise private variables */
- PUBLIC void initsource()
- {
- filnamptr = hid_filnambuf;
- getstak = hid_getstak;
- clearsource(); /* sentinel to invoke blank skipping */
- }
- PUBLIC fd_t open_input(name)
- char *name;
- {
- fd_t fd;
- #if BIGBUFFER == 1
- off_t filelength = -1;
- if( mem_start == 0 && strcmp(name, "-") == 0 )
- fd = 0;
- else
- #endif
- #ifdef O_BINARY
- if ((unsigned) (fd = open(name, O_RDONLY|O_BINARY)) > 255)
- as_abort("error opening input file");
- #else
- if ((unsigned) (fd = open(name, O_RDONLY)) > 255)
- as_abort("error opening input file");
- #endif
- #if BIGBUFFER == 1
- if( mem_start == 0 )
- {
- size_t memsize = 0;
- int cc;
- if(fd)
- {
- struct stat st;
- if( fstat(fd, &st) >= 0 )
- filelength = st.st_size;
- if( filelength > (((unsigned)-1)>>1)-3 )
- {
- mem_end = mem_start = "\n\n";
- goto cant_do_this;
- }
- }
- if (filelength > 0) {
- if( (mem_start = malloc(filelength+4)) == 0 )
- {
- mem_end = mem_start = "\n\n";
- goto cant_do_this;
- }
- memsize = filelength;
- filelength = read(fd, mem_start, filelength);
- } else
- filelength = 0;
- for(;;)
- {
- if( filelength >= memsize )
- {
- if (memsize > 16000)
- mem_start = asrealloc(mem_start, (memsize+=16384)+4);
- else
- mem_start = asrealloc(mem_start, (memsize+=memsize+32)+4);
- }
- cc = read(fd, mem_start+filelength,
- (size_t)(memsize-filelength));
- if( cc <= 0 ) break;
- filelength+=cc;
- }
- *(mem_end=mem_start+filelength) = '\n';
- mem_end[1] = '\0';
- infiln = infil0 = 0; /* Assemble from memory */
- if(fd) close(fd);
- fd = -1;
- }
- cant_do_this:
- #endif
- clearsource();
- return fd;
- }
- /*
- handle GET pseudo_op
- stack state of current file, open new file and reset global state vars
- file must be seekable for the buffer discard/restore method to work
- */
- PUBLIC void pget()
- {
- if (infiln >= MAXGET)
- error(GETOV);
- else
- {
- char save;
- skipline();
- listline();
- getstak->fd = infil;
- getstak->line = linum;
- if (infiln != 0)
- #if MINIBUF == 1
- getstak->position = inp_tell(infil);
- #else
- getstak->position = lseek(infil, 0L, 1);
- #endif
- else
- getstak->position = (off_t)eol_ptr;
- ++getstak;
- ++infiln;
- linum = 0;
- for(lineptr=symname; *lineptr != EOLCHAR; lineptr++)
- if( *lineptr <= ' ' ) break;
- save = *lineptr; *lineptr = '\0';
- infil = open_input(symname);
- *lineptr = save;
- getsym();
- }
- }
- /* process end of file */
- /* close file, unstack old file if current one is included */
- /* otherwise switch pass 0 to pass 1 or exit on pass 2 */
- /* end of file may be from phyical end of file or an END statement */
- PUBLIC void pproceof()
- {
- if (infiln != 0)
- close(infil);
- if (infiln == infil0)
- /* all conditionals must be closed before end of main file (not GETs) */
- {
- if (blocklevel != 0)
- error(EOFBLOCK);
- if (iflevel != 0)
- error(EOFIF);
- if (pass && (lcdata & UNDBIT))
- error(EOFLC);
- lcptr->data = lcdata;
- lcptr->lc = lc;
- }
- /* macros must be closed before end of all files */
- if (macload)
- error(EOFMAC);
- if (linebuf != lineptr)
- listline(); /* last line or line after last if error */
- if (infiln != infil0)
- {
- --getstak;
- infil = getstak->fd;
- linum = getstak->line;
- if (--infiln == 0)
- eol_ptr = (void*)getstak->position;
- else
- #if MINIBUF == 1
- inp_seek(infil, getstak->position);
- #else
- lseek(infil, getstak->position, 0);
- #endif
- }
- else if (pass!=last_pass)
- {
- pass++;
- if( last_pass>1 && last_pass<30 && dirty_pass && pass==last_pass )
- last_pass++;
- if( pass==last_pass )
- objheader(); /* while pass 1 data all valid */
- binmbuf = 0; /* reset zero variables */
- maclevel = iflevel = blocklevel =
- totwarn = toterr = linum = macnum = 0;
- initp1p2(); /* reset other varaiables */
- if(pass==last_pass)
- binaryc = binaryg;
- #ifdef I80386
- defsize = idefsize;
- cpuid = origcpuid;
- #endif
- if(pass==last_pass)
- {
- list.current = list.global;
- maclist.current = maclist.global;
- as_warn.current = TRUE;
- if (as_warn.semaphore < 0)
- as_warn.current = FALSE;
- }
- if (infiln != 0)
- infil = open_input(filnamptr);
- else
- eol_ptr=0;
- if(pass==last_pass)
- binheader();
- line_zero();
- }
- else
- finishup();
- }
- /*
- read 1 line of source.
- Source line ends with '\n', line returned is null terminated without '\n'.
- Control characters other than blank, tab and newline are discarded.
- Long lines (length > LINLEN) are truncated, and an error is generated.
- On EOF, calls pproceof(), and gets next line unless loading a macro.
- This is where macro lines are recursively expanded.
- */
- PUBLIC void readline()
- {
- int cc = 0;
- listpre = FALSE; /* not listed yet */
- if (maclevel != 0)
- {
- register char *bufptr; /* hold *bufptr in a reg char variable */
- register char *reglineptr; /* if possible (not done here) */
- char *oldbufptr;
- struct schain_s *parameters;
- char paramnum;
- unsigned int remaining; /* space remaining in line + 2 */
- /* value 0 not used except for temp predec */
- /* value 1 means error already gen */
- /* values 1 and 2 mean no space */
- for (; maclevel != 0;
- macpar = macstak->parameters, ++macstak, --maclevel)
- if (*(bufptr = macstak->text) != ETB)
- /* nonempty macro, process it and return without continuing the for loop */
- {
- if (!macflag)
- {
- maclinebuf = linebuf;
- maclineptr = lineptr;
- macflag = TRUE;
- }
- remaining = LINLEN + 2;
- lineptr = linebuf = reglineptr = hid_linebuf;
- while (*bufptr++ != EOLCHAR)
- {
- if (bufptr[-1] == MACROCHAR && *bufptr >= '0' && *bufptr <= '9')
- {
- parameters = macstak->parameters;
- for (paramnum = *bufptr++; paramnum-- != '0';)
- if ((parameters = parameters->next) == NUL_PTR)
- break;
- if (parameters != NUL_PTR)
- {
- for (oldbufptr = bufptr, bufptr = parameters->string;
- *bufptr++ != 0;)
- {
- if (--remaining <= 1)
- {
- if (remaining != 0)
- line_too_long();
- remaining = 1;
- break; /* forget rest, param on 1 line */
- }
- *reglineptr++ = bufptr[-1];
- }
- bufptr = oldbufptr;
- }
- }
- else
- {
- if (--remaining <= 1)
- {
- if (remaining != 0)
- line_too_long();
- remaining = 1;
- }
- else
- *reglineptr++ = bufptr[-1];
- }
- }
- macstak->text = bufptr;
- #if 0
- *reglineptr = 0;
- printf("MLINE:%s.\n", lineptr);
- #endif
- *reglineptr = EOLCHAR;
- return;
- }
- }
- if (macflag)
- {
- linebuf = maclinebuf;
- lineptr = maclineptr;
- macflag = FALSE;
- }
- /* End of macro expansion processing */
- again: /* On EOF for main or included files */
- ++linum;
- #if BIGBUFFER == 1
- if( infiln == 0 )
- {
- if( eol_ptr == 0 ) eol_ptr = mem_start-1;
- else *eol_ptr = '\n';
- linebuf = lineptr = eol_ptr + 1;
- cc = (mem_end - linebuf);
- /* memchr not strchr 'cause some implementations of strchr are like:
- memchr(x,y,strlen(x)); this is _BAD_ with BIGBUFFER
- */
- if((eol_ptr = memchr(linebuf, '\n', cc)) == 0 && cc > 0)
- cc = -1;
- }
- else
- #endif
- {
- lineptr = linebuf = hid_linebuf;
- *(hid_linebuf+sizeof(hid_linebuf)-2) = '\0'; /* Term */
- #if MINIBUF == 1
- cc = inp_line(infil, linebuf, sizeof(hid_linebuf)-2);
- if( cc >= 0 )
- eol_ptr = linebuf+cc-1;
- #else
- cc = read(infil, linebuf, sizeof(hid_linebuf)-2);
- if( cc > 0 )
- {
- eol_ptr = memchr(linebuf, '\n', cc);
- if( eol_ptr == 0 )
- eol_ptr = hid_linebuf+sizeof(hid_linebuf)-2;
- else
- lseek(infil, (long)(eol_ptr+1-hid_linebuf)-cc, 1);
- }
- #endif
- }
- if( cc <= 0 )
- {
- if( cc < 0 ) as_abort("error reading input");
- clearsource();
- pproceof();
- listpre = FALSE;
- if (macload)
- {
- symname = lineptr;
- return; /* macro not allowed across eof */
- }
- goto again;
- }
- #if 0
- *eol_ptr = 0;
- printf("LINE:%s.\n", lineptr);
- #endif
- *eol_ptr = EOLCHAR;
- }
- PUBLIC void skipline()
- {
- if(macflag)
- lineptr = strchr(hid_linebuf, EOLCHAR);
- else
- lineptr = eol_ptr;
- }
- #if MINIBUF == 1
- PRIVATE char input_buf[1024]; /* input buffer */
- PRIVATE int in_start=0, in_end=0;
- PRIVATE long ftpos = 0;
- PRIVATE int lastfd = -1;
- PRIVATE int inp_line(fd, buf, size)
- int fd;
- char * buf;
- int size;
- {
- int offt = 0;
- if( fd!=lastfd ) inp_seek(-1, 0L);
- for(;;)
- {
- if(in_start >= in_end)
- {
- lastfd = -1;
- ftpos = lseek(fd, 0L, 1);
- in_start = 0;
- in_end = read(fd, input_buf, sizeof(input_buf));
- if( in_end <=0 ) return in_end;
- lastfd = fd;
- }
- if( (buf[offt++] = input_buf[in_start++]) == '\n' || offt >= size )
- break;
- }
- return offt;
- }
- PRIVATE long inp_tell(fd)
- int fd;
- {
- if( fd != lastfd )
- return lseek(fd, 0L, 1);
- else
- return ftpos + in_start;
- }
- PRIVATE void inp_seek(fd, posn)
- int fd;
- long posn;
- {
- if( lastfd != -1 )
- lseek(lastfd, ftpos+in_start, 0);
- lastfd = -1;
- in_end = 0;
- if( fd >= 0 )
- lseek(fd, posn, 0);
- }
- #endif
|