+++ /dev/null
-/* aslex.c */
-
-/*
- * (C) Copyright 1989-1995
- * All Rights Reserved
- *
- * Alan R. Baldwin
- * 721 Berkeley St.
- * Kent, Ohio 44240
- *
- * 28-Oct-97 JLH bug in getst(): sign extend on ~(SPACE|ILL)
- * causes infinite loop
- */
-
-#include <stdio.h>
-#include <setjmp.h>
-#include <string.h>
-#include "asm.h"
-
-/*)Module aslex.c
- *
- * The module aslex.c includes the general lexical
- * analysis routines for the assembler.
- *
- * aslex.c contains the following functions:
- * char endline()
- * char get()
- * VOID getid(id,c)
- * int as_getline()
- * int getmap()
- * char getnb()
- * VOID getst()
- * int more()
- * VOID unget(c)
- *
- * aslex.c contains no local/static variables
- */
-
-/*)Function VOID getid(id,c)
- *
- * char * id a pointer to a string of
- * maximum length NCPS
- * int c mode flag
- * >=0 this is first character to
- * copy to the string buffer
- * <0 skip white space, first
- * character must be a LETTER
- *
- * The function getid() scans the current assembler-source text line
- * from the current position copying the next LETTER | DIGIT string
- * into the external string buffer (id). The string ends when a non
- * LETTER or DIGIT character is found. The maximum number of
- * characters copied is NCPS. If the input string is larger than
- * NCPS characters then the string is truncated, if the input string
- * is shorter than NCPS characters then the string is NULL filled.
- * If the mode argument (c) is >=0 then (c) is the first character
- * copied to the string buffer, if (c) is <0 then intervening white
- * space (SPACES and TABS) are skipped and the first character found
- * must be a LETTER else a 'q' error terminates the parse of this
- * assembler-source text line.
- *
- * local variables:
- * char * p pointer to external string buffer
- * int c current character value
- *
- * global variables:
- * char ctype[] a character array which defines the
- * type of character being processed.
- * This index is the character
- * being processed.
- *
- * called functions:
- * char get() aslex.c
- * char getnb() aslex.c
- * VOID unget() aslex.c
- *
- * side effects:
- * use of getnb(), get(), and unget() updates the
- * global pointer ip, the position in the current
- * assembler-source text line.
- */
-
-VOID
-getid(id, c)
-register int c;
-char *id;
-{
- register char *p;
-
- if (c < 0) {
- c = getnb();
- if ((ctype[c] & LETTER) == 0)
- qerr();
- }
- p = id;
- do {
- if (p < &id[NCPS])
- *p++ = c;
- } while (ctype[c=get()] & (LETTER|DIGIT));
- unget(c);
- while (p < &id[NCPS])
- *p++ = 0;
-}
-
-/*)Function VOID getst(id,c)
- *
- * char * id a pointer to a string of
- * maximum length NCPS
- * int c mode flag
- * >=0 this is first character to
- * copy to the string buffer
- * <0 skip white space, first
- * character must be a LETTER
- *
- * The function getnbid() scans the current assembler-source text line
- * from the current position copying the next character string into
- * the external string buffer (id). The string ends when a SPACE or
- * ILL character is found. The maximum number of
- * characters copied is NCPS. If the input string is larger than
- * NCPS characters then the string is truncated, if the input string
- * is shorter than NCPS characters then the string is NULL filled.
- * If the mode argument (c) is >=0 then (c) is the first character
- * copied to the string buffer, if (c) is <0 then intervening white
- * space (SPACES and TABS) are skipped and the first character found
- * must be a LETTER else a 'q' error terminates the parse of this
- * assembler-source text line.
- *
- * local variables:
- * char * p pointer to external string buffer
- * int c current character value
- *
- * global variables:
- * char ctype[] a character array which defines the
- * type of character being processed.
- * This index is the character
- * being processed.
- *
- * called functions:
- * char get() aslex.c
- * char getnb() aslex.c
- * VOID unget() aslex.c
- *
- * side effects:
- * use of getnb(), get(), and unget() updates the
- * global pointer ip, the position in the current
- * assembler-source text line.
- */
-
-VOID
-getst(id, c)
-register int c;
-char *id;
-{
- register char *p;
-
- if (c < 0) {
- c = getnb();
- if ((ctype[c] & LETTER) == 0)
- qerr();
- }
- p = id;
- do {
- if (p < &id[NCPS])
- *p++ = c;
- } while (ctype[c=get()] & (0xFF - (SPACE|ILL)));
- unget(c);
- while (p < &id[NCPS])
- *p++ = 0;
-}
-
-/*)Function char getnb()
- *
- * The function getnb() scans the current assembler-source
- * text line returning the first character not a SPACE or TAB.
- *
- * local variables:
- * int c current character from
- * assembler-source text line
- *
- * global variables:
- * none
- *
- * called functions:
- * char get() aslex.c
- *
- * side effects:
- * use of get() updates the global pointer ip, the position
- * in the current assembler-source text line
- */
-
-char
-getnb()
-{
- register int c;
-
- while ((c=get()) == ' ' || c == '\t')
- ;
- return (c);
-}
-
-/*)Function char get()
- *
- * The function get() returns the next character in the
- * assembler-source text line, at the end of the line a
- * NULL character is returned.
- *
- * local variables:
- * int c current character from
- * assembler-source text line
- *
- * global variables:
- * char * ip pointer into the current
- * assembler-source text line
- *
- * called functions:
- * none
- *
- * side effects:
- * updates ip to the next character position in the
- * assembler-source text line. If ip is at the end of the
- * line, ip is not updated.
- */
-
-char
-get()
-{
- register int c;
-
- if ((c = *ip) != 0)
- ++ip;
- return (c);
-}
-
-/*)Function VOID unget(c)
- *
- * int c value of last character read from
- * assembler-source text line
- *
- * If (c) is not a NULL character then the global pointer ip
- * is updated to point to the preceeding character in the
- * assembler-source text line.
- *
- * NOTE: This function does not push the character (c)
- * back into the assembler-source text line, only
- * the pointer ip is changed.
- *
- * local variables:
- * int c last character read from
- * assembler-source text line
- *
- * global variables:
- * char * ip position into the current
- * assembler-source text line
- *
- * called functions:
- * none
- *
- * side effects:
- * ip decremented by 1 character position
- */
-
-VOID
-unget(c)
-{
- if (c)
- if (ip != ib)
- --ip;
-}
-
-/*)Function int getmap(d)
- *
- * int d value to compare with the
- * assembler-source text line character
- *
- * The function getmap() converts the 'C' style characters \b, \f,
- * \n, \r, and \t to their equivalent ascii values and also
- * converts 'C' style octal constants '\123' to their equivalent
- * numeric values. If the first character is equivalent to (d) then
- * a (-1) is returned, if the end of the line is detected then
- * a 'q' error terminates the parse for this line, or if the first
- * character is not a \ then the character value is returned.
- *
- * local variables:
- * int c value of character from the
- * assembler-source text line
- * int n looping counter
- * int v current value of numeric conversion
- *
- * global variables:
- * none
- *
- * called functions:
- * char get() aslex.c
- *
- * side effects:
- * use of get() updates the global pointer ip the position
- * in the current assembler-source text line
- */
-
-int
-getmap(d)
-{
- register int c, n, v;
-
- if ((c=get()) == '\0')
- qerr();
- if (c == d)
- return (-1);
- if (c == '\\') {
- c = get();
- switch (c) {
-
- case 'b':
- c = '\b';
- break;
-
- case 'f':
- c = '\f';
- break;
-
- case 'n':
- c = '\n';
- break;
-
- case 'r':
- c = '\r';
- break;
-
- case 't':
- c = '\t';
- break;
-
- case '0':
- case '1':
- case '2':
- case '3':
- case '4':
- case '5':
- case '6':
- case '7':
- n = 0;
- v = 0;
- while (++n<=3 && c>='0' && c<='7') {
- v = (v<<3) + c - '0';
- c = get();
- }
- unget(c);
- c = v;
- break;
- }
- }
- return (c);
-}
-
-/*)Function int as_getline()
- *
- * The function as_getline() reads a line of assembler-source text
- * from an assembly source text file or an include file.
- * Lines of text are processed from assembler-source files until
- * all files have been read. If an include file is opened then
- * lines of text are read from the include file (or nested
- * include file) until the end of the include file is found.
- * The input text line is copied into the global string ib[]
- * and converted to a NULL terminated string. The function
- * as_getline() returns a (1) after succesfully reading a line
- * or a (0) if all files have been read.
- *
- * local variables:
- * int i string length
- *
- * global variables:
- * char ib[] string buffer containing
- * assembler-source text line
- * char ifp[] array of file handles for
- * include files
- * int incfil index for ifp[] specifies
- * active include file
- * int incline[] array of include file
- * line numbers
- * char sfp[] array of file handles for
- * assembler source files
- * int cfile index for sfp[] specifies
- * active source file
- * int srcline[] array of source file
- * line numbers
- * int inpfil maximum input file index
- *
- * called functions:
- * int fclose() c-library
- * char * fgets() c-library
- * int strlen() c-library
- *
- * side effects:
- * include file will be closed at detection of end of file.
- * the next sequential source file may be selected.
- * the global file indexes incfil or cfile may be changed.
- * The respective source line or include line counter
- * will be updated.
- */
-
-int
-as_getline()
-{
-loop: if (incfil >= 0) {
- if (fgets(ib, sizeof ib, ifp[incfil]) == NULL) {
- fclose(ifp[incfil--]);
- lop = NLPP;
- goto loop;
- } else {
- ++incline[incfil];
- }
- } else {
- if (fgets(ib, sizeof ib, sfp[cfile]) == NULL) {
- if (++cfile <= inpfil) {
- srcline[cfile] = 0;
- goto loop;
- }
- return (0);
- } else {
- ++srcline[cfile];
- }
- }
- chop_crlf(ib);
- return (1);
-}
-
-/*)Function int more()
- *
- * The function more() scans the assembler-source text line
- * skipping white space (SPACES and TABS) and returns a (0)
- * if the end of the line or a comment delimeter (;) is found,
- * or a (1) if their are additional characters in the line.
- *
- * local variables:
- * int c next character from the
- * assembler-source text line
- *
- * global variables:
- * none
- *
- * called functions:
- * char getnb() aslex.c
- * VOID unget() aslex.c
- *
- * side effects:
- * use of getnb() and unget() updates the global pointer ip
- * the position in the current assembler-source text line
- */
-
-int
-more()
-{
- register int c;
-
- c = getnb();
- unget(c);
- return( (c == '\0' || c == ';') ? 0 : 1 );
-}
-
-/*)Function char endline()
- *
- * The function endline() scans the assembler-source text line
- * skipping white space (SPACES and TABS) and returns the next
- * character or a (0) if the end of the line is found or a
- * comment delimiter (;) is found.
- *
- * local variables:
- * int c next character from the
- * assembler-source text line
- *
- * global variables:
- * none
- *
- * called functions:
- * char getnb() aslex.c
- *
- * side effects:
- * use of getnb() updates the global pointer ip the
- * position in the current assembler-source text line
- */
-
-char
-endline()
-{
- register int c;
-
- c = getnb();
- return( (c == '\0' || c == ';') ? 0 : c );
-}
-
-/*)Function VOID chop_crlf(str)
- *
- * char *str string to chop
- *
- * The function chop_crlf() removes trailing LF or CR/LF from
- * str, if present.
- *
- * local variables:
- * int i string length
- *
- * global variables:
- * none
- *
- * functions called:
- * none
- *
- * side effects:
- * none
- */
-
-VOID
-chop_crlf(str)
-char *str;
-{
- register int i;
-
- i = strlen(str);
- if (i >= 1 && str[i-1] == '\n') str[i-1] = 0;
- if (i >= 2 && str[i-2] == '\r') str[i-2] = 0;
-}
projects / fw / sdcc / blobdiff