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zmakebas.c
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/* zmakebas - convert a text file containing a speccy Basic program
* into an actual program file loadable on a speccy.
*
* Public domain by Russell Marks, 1998.
*/
/* warning: this is probably the least structured program ever.
* I guess that's what comes from hacking something into existence... :-/
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#ifdef HAVE_GETOPT
#include <unistd.h>
#endif
#include <math.h>
#include <ctype.h>
#if defined(__TURBOC__) && !defined(MSDOS)
#define MSDOS
#endif
#define VERSION "1.5"
#define DEFAULT_OUTPUT "out.tap"
#define REM_TOKEN_NUM 234
#define BIN_TOKEN_NUM 196
#define DEFFN_TOKEN_NUM 206
/* tokens are stored (and looked for) in reverse speccy-char-set order,
* to avoid def fn/fn and go to/to screwups. There are two entries for
* each token - this is to allow for things like "go to" which can
* actually be entered (thank ghod) as "goto". The one extension to
* this I've made is that randomize can be entered with -ize or -ise.
*/
char *tokens[] = {
"%listen #", "%listen#",
"%accept #", "%accept#",
"%close #", "%close#",
"-----", "",
"copy", "",
"return", "",
"clear", "",
"draw", "",
"cls", "",
"if", "",
"randomize", "randomise",
"save", "",
"run", "",
"plot", "",
"print", "",
"poke", "",
"next", "",
"pause", "",
"let", "",
"list", "",
"load", "",
"input", "",
"go sub", "gosub",
"go to", "goto",
"for", "",
"rem", "",
"dim", "",
"continue", "",
"border", "",
"new", "",
"restore", "",
"data", "",
"read", "",
"stop", "",
"llist", "",
"lprint", "",
"out", "",
"over", "",
"inverse", "",
"bright", "",
"flash", "",
"paper", "",
"ink", "",
"circle", "",
"beep", "",
"verify", "",
"merge", "",
"close #", "close#",
"open #", "open#",
"erase", "",
"move", "",
"format", "",
"cat", "",
"def fn", "deffn",
"step", "",
"to", "",
"then", "",
"line", "",
"<>", "",
">=", "",
"<=", "",
"and", "",
"or", "",
"bin", "",
"not", "",
"chr$", "",
"str$", "",
"usr", "",
"in", "",
"peek", "",
"abs", "",
"sgn", "",
"sqr", "",
"int", "",
"exp", "",
"ln", "",
"atn", "",
"acs", "",
"asn", "",
"tan", "",
"cos", "",
"sin", "",
"len", "",
"val", "",
"code", "",
"val$", "",
"tab", "",
"at", "",
"attr", "",
"screen$", "",
"point", "",
"fn", "",
"pi", "",
"inkey$", "",
"rnd", "",
"play", "",
"spectrum", "",
NULL
};
char *special_tokens[] = {
NULL
};
char *tokens81[]={
"copy", "",
"return", "",
"clear", "",
"unplot", "",
"cls", "",
"if", "",
"rand", "",
"save", "",
"run", "",
"plot", "",
"print", "",
"poke", "",
"next", "",
"pause", "",
"let", "",
"list", "",
"load", "",
"input", "",
"go sub", "gosub",
"go to", "goto",
"for", "",
"rem", "",
"dim", "",
"cont", "",
"scroll", "",
"new", "",
"fast", "",
"slow", "",
"stop", "",
"llist", "",
"lprint", "",
"step", "",
"to", "",
"then", "",
"<>", "",
">=", "",
"<=", "",
"and", "",
"or", "",
"**", "",
"not", "",
"chr$", "",
"str$", "",
"usr", "",
"peek", "",
"abs", "",
"sgn", "",
"sqr", "",
"int", "",
"exp", "",
"ln", "",
"atn", "",
"acs", "",
"asn", "",
"tan", "",
"cos", "",
"sin", "",
"len", "",
"val", "",
"code", "",
"val$", "",
"tab", "",
"at", "",
"`", "",
"pi", "",
"inkey$", "",
"rnd", "",
NULL};
/* the whole raw basic file is written to filebuf; no output is generated
* until the whole program has been converted. This is to allow a TAP
* to be output on a non-seekable file (stdout).
*/
#ifdef MSDOS
#define MAX_LABELS 500
unsigned char filebuf[32768];
char infile[256], outfile[256];
#else
#define MAX_LABELS 2000
unsigned char filebuf[49152];
char infile[1024], outfile[1024];
#endif
#define MAX_LABEL_LEN 16
/* this is needed for tap files too: */
unsigned char headerbuf[0x74];
int output_tape = 1, use_labels = 0, zx81mode = 0;
unsigned int startline = 0x8000;
int autostart = 10, autoincr = 2;
char speccy_filename[11];
int labelend = 0;
unsigned char labels[MAX_LABELS][MAX_LABEL_LEN + 1];
int label_lines[MAX_LABELS];
unsigned char startlabel[MAX_LABEL_LEN + 1];
#ifndef HAVE_GETOPT
/* ok, well here's a crude getopt clone I wrote a few years ago.
* It's not great, but it's good enough for zmakebas at least.
*/
int optopt = 0, opterr = 0, optind = 1;
char *optarg = NULL;
/* holds offset in current argv[] value */
static int optpos = 1;
/* This routine assumes that the caller is pretty sane and doesn't
* try passing an invalid 'optstring' or varying argc/argv.
*/
int getopt(int argc, char *argv[], char *optstring) {
char *ptr;
/* check for end of arg list */
if (optind == argc || *(argv[optind]) != '-' || strlen(argv[optind]) <= 1)
return (-1);
if ((ptr = strchr(optstring, argv[optind][optpos])) == NULL)
return ('?'); /* error: unknown option */
else {
optopt = *ptr;
if (ptr[1] == ':') {
if (optind == argc - 1)
return (':'); /* error: missing option */
optarg = argv[optind + 1];
optpos = 1;
optind += 2;
return (optopt); /* return early, avoiding the normal increment */
}
}
/* now increment position ready for next time.
* no checking is done for the end of args yet - this is done on
* the next call.
*/
optpos++;
if (optpos >= strlen(argv[optind])) {
optpos = 1;
optind++;
}
return (optopt); /* return the found option */
}
#endif /* !HAVE_GETOPT */
/* This routine converts normal ASCII code to special code used in ZX81.
*/
void *memcpycnv(void *dst, void *src, size_t num) {
unsigned char in;
while (num--){
in= *((char *)src++);
if ( in >= '0' && in <= '9' )
*((char *)dst++) = in - 20;
else if( in >= 'A' && in <= 'Z' )
*((char *)dst++) = in - 27;
else if( in >= 'a' && in <= 'z' )
*((char *)dst++) = in + 69;
else switch( in ) {
case 0x0d: *((char *)dst++) = 0x76; break; // enter
case 0x20: *((char *)dst++) = 0x00; break; // space
case 0x22: *((char *)dst++) = 0x0b; break; // "
case 0x24: *((char *)dst++) = 0x0d; break; // $
case 0x28: *((char *)dst++) = 0x10; break; // (
case 0x29: *((char *)dst++) = 0x11; break; // )
case 0x2a: *((char *)dst++) = 0x17; break; // *
case 0x2b: *((char *)dst++) = 0x15; break; // +
case 0x2c: *((char *)dst++) = 0x1a; break; // ,
case 0x2d: *((char *)dst++) = 0x16; break; // -
case 0x2e: *((char *)dst++) = 0x1b; break; // .
case 0x2f: *((char *)dst++) = 0x18; break; // /
case 0x3a: *((char *)dst++) = 0x0e; break; // :
case 0x3b: *((char *)dst++) = 0x19; break; // ;
case 0x3c: *((char *)dst++) = 0x13; break; // <
case 0x3d: *((char *)dst++) = 0x14; break; // =
case 0x3e: *((char *)dst++) = 0x12; break; // >
case 0x3f: *((char *)dst++) = 0x0f; break; // ?
case 0x7c: *((char *)dst++) = 0x41; break; // INKEY$
case 0x7d: *((char *)dst++) = 0x40; break; // RND
case 0x7e: *((char *)dst++) = in; // number
*((char *)dst++) = *((char *)src++);
*((char *)dst++) = *((char *)src++);
*((char *)dst++) = *((char *)src++);
*((char *)dst++) = *((char *)src++);
*((char *)dst++) = *((char *)src++); break;
case 0x7f: *((char *)dst++) = 0x42; break; // PI
default: *((char *)dst++) = in;
}
}
}
/* dbl2spec() converts a double to an inline-basic-style speccy FP number.
*
* usage: dbl2spec(num,&exp,&man);
*
* num is double to convert.
* pexp is an int * to where to return the exponent byte.
* pman is an unsigned long * to where to return the 4 mantissa bytes.
* bit 31 is bit 7 of the 0th (first) mantissa byte, and bit 0 is bit 0 of
* the 3rd (last). As such, the unsigned long returned *must* be written
* to whatever file in big-endian format to make any sense to a speccy.
*
* returns 1 if ok, 0 if exponent too big.
*/
int dbl2spec(double num, int *pexp, unsigned long *pman) {
int exp;
unsigned long man;
/* check for small integers */
if ( !zx81mode && num == (long) num && num >= -65535.0 && num <= 65535.0) {
/* ignores sign - see below, which applies to ints too. */
long tmp = (long) fabs(num);
exp = 0;
man = ((tmp % 256) << 16) | ((tmp >> 8) << 8);
} else {
int f;
/* It appears that the sign bit is always left as 0 when floating-point
* numbers are embedded in programs, and the speccy appears to use the
* '-' character to detemine negativity - tests confirm this.
* As such, we *completely ignore* the sign of the number.
* exp is 0x80+exponent.
*/
num = fabs(num);
/* binary standard form goes from 0.50000... to 0.9999...(dec), like
* decimal which goes from 0.10000... to 0.9999....
*/
/* as such, if the number is >=1, it gets divided by 2, and exp++.
* And if the number is <0.5, it gets multiplied by 2, and exp--.
*/
exp = 0;
while ( num >= 1.0) {
num /= 2.0;
exp++;
}
while ( num != 0 && num < 0.5) {
num *= 2.0;
exp--;
}
/* so now the number is in binary standard form in exp and num.
* we check the range of exp... -128 <= exp <= 127.
* (if outside, we return error (i.e. 0))
*/
if (exp<-128 || exp > 127)
return (0);
if ( num != 0 )
exp = 128 + exp;
/* so now all we need to do is roll the bits off the mantissa in `num'.
* we start at the 0.5ths bit at bit 0, and shift left 1 each time
* round the loop.
*/
num *= 2.0; /* make it so that the 0.5ths bit is the integer part, */
/* and the rest is the fractional (0.xxx) part. */
man = 0;
for (f = 0; f < 32; f++) {
man <<= 1;
man |= (int) num;
num -= (int) num;
num *= 2.0;
}
/* Now, if (int)num is non-zero (well, 1) then we should generally
* round up 1. We don't do this if it would cause an overflow in the
* mantissa, though.
*/
if ((int) num && man != 0xFFFFFFFF) man++;
/* finally, zero out the top bit */
man &= 0x7FFFFFFF;
}
/* done */
*pexp = exp;
*pman = man;
return (1);
}
unsigned long grok_hex(unsigned char **ptrp, int textlinenum) {
static char *hexits = "0123456789abcdefABCDEF", *lookup;
unsigned char *ptr = *ptrp;
unsigned long v = 0, n;
/* we know the number starts with "0x" and we're pointing to it */
ptr += 2;
if (strchr(hexits, *ptr) == NULL) {
fprintf(stderr, "line %d: bad BIN 0x... number\n", textlinenum);
exit(1);
}
while (*ptr && (lookup = strchr(hexits, *ptr)) != NULL) {
n = lookup - hexits;
if (n > 15) n -= 6;
v = v * 16 + n;
ptr++;
}
*ptrp = ptr;
return (v);
}
unsigned long grok_binary(unsigned char **ptrp, int textlinenum) {
unsigned long v = 0;
unsigned char *ptr = *ptrp;
while (isspace(*ptr)) ptr++;
if (*ptr != '0' && *ptr != '1') {
fprintf(stderr, "line %d: bad BIN number\n", textlinenum);
exit(1);
}
if (ptr[1] == 'x' || ptr[1] == 'X') {
*ptrp = ptr;
return (grok_hex(ptrp, textlinenum));
}
while (*ptr == '0' || *ptr == '1') {
v *= 2;
v += *ptr - '0';
ptr++;
}
*ptrp = ptr;
return (v);
}
void usage_help() {
printf("zmakebas - public domain by Russell Marks.\n\n");
printf("usage: zmakebas [-hlprv] [-a line] [-i incr] [-n speccy_filename]\n");
printf(" [-o output_file] [-s line] [input_file]\n\n");
printf(" -v output version number.\n");
printf(" -a set auto-start line of basic file (default none).\n");
printf(" -h give this usage help.\n");
printf(" -i in labels mode, set line number incr. (default 2).\n");
printf(" -l use labels rather than line numbers.\n");
printf(" -n set Spectrum filename (to be given in tape header).");
printf("\n -o specify output file (default `%s').\n",
DEFAULT_OUTPUT);
printf(" -p output .p instead (set ZX81 mode).\n");
printf(" -r output raw headerless file (default is .tap file).\n");
printf(" -s in labels mode, set starting line number ");
printf("(default 10).\n");
}
/* cmdline option parsing routine.
*/
void parse_options(int argc, char *argv[]) {
int done = 0;
done = 0;
opterr = 0;
startlabel[0] = 0;
do
switch (getopt(argc, argv, "pa:hi:ln:o:rs:v")) {
case 'p':
zx81mode= 1; break;
case 'a':
if (*optarg == '@')
if (strlen(optarg + 1) > MAX_LABEL_LEN)
fprintf(stderr, "Auto-start label too long\n"), exit(1);
else
strcpy(startlabel, optarg + 1);
else {
startline = (unsigned int) atoi(optarg);
if (startline > 9999)
fprintf(stderr, "Auto-start line must be in the range 0 to 9999.\n"),
exit(1);
}
break;
case 'v':
printf(VERSION);
printf("\n");
exit(1);
case 'h': /* usage help */
usage_help();
exit(1);
case 'i':
autoincr = (int) atoi(optarg);
/* this is unnecessarily restrictive but keeps things a bit sane */
if (autoincr < 1 || autoincr > 1000)
fprintf(stderr, "Label line incr. must be in the range 1 to 1000.\n"),
exit(1);
break;
case 'l':
use_labels = 1;
break;
case 'n':
strncpy(speccy_filename, optarg, 10);
speccy_filename[10] = 0;
break;
case 'o':
strcpy(outfile, optarg);
break;
case 'r': /* output raw file */
output_tape = 0;
break;
case 's':
autostart = (int) atoi(optarg);
if (autostart < 0 || autostart > 9999)
fprintf(stderr, "Label start line must be in the range 0 to 9999.\n"),
exit(1);
break;
case ':':
case '?':
switch (optopt) {
case 'a':
fprintf(stderr, "The `a' option takes a line number arg.\n");
break;
case 'i':
fprintf(stderr, "The `i' option takes a line incr. arg.\n");
break;
case 'n':
fprintf(stderr, "The `n' option takes a Spectrum filename arg.\n");
break;
case 'o':
fprintf(stderr, "The `o' option takes a filename arg.\n");
break;
case 's':
fprintf(stderr, "The `s' option takes a line number arg.\n");
break;
default:
fprintf(stderr, "Option `%c' not recognised.\n", argv[optind][1]);
}
exit(1);
case -1:
done = 1;
} while (!done);
// Added optind==argc so that usagehelp is displayed if no arguments are supplied (Alistair Neil)
if (optind < argc - 1 || optind == argc) /* two or more remaining args */
usage_help(),
exit(1);
if (optind == argc - 1) /* one remaining arg */
strcpy(infile, argv[optind]);
}
int grok_block(unsigned char *ptr, int textlinenum) {
static char *lookup[] = {
" ", " '", "' ", "''", " .", " :", "'.", "':",
". ", ".'", ": ", ":'", "..", ".:", ":.", "::",
NULL
};
static char *lookup81[] = {
" ", "' ", " '", "''", ". ", ": ", ".'", ":'",
"::", ".:", ":.", "..", "':", " :", "'.", " .",
"!:", "!.", "!'", "|:", "|.", "|'",
NULL
};
char **lptr;
int f = 0, v = -1;
for (lptr = zx81mode ? lookup81 : lookup; *lptr != NULL; lptr++, f++) {
if (strncmp(ptr + 1, *lptr, 2) == 0) {
if ( zx81mode ) {
if ( f < 8 )
v = f;
else if ( f < 16 )
v = f + 0x78;
else if ( f < 19 )
v = f - 8;
else
v = f + 117;
}
else
v = f + 128;
break;
}
}
if (v == -1) {
fprintf(stderr, "line %d: invalid block graphics escape\n", textlinenum);
exit(1);
}
return (v);
}
int main(int argc, char *argv[]) {
#ifdef MSDOS
static unsigned char buf[512], lcasebuf[512], outbuf[1024];
#else
static unsigned char buf[2048], lcasebuf[2048], outbuf[4096];
#endif
int f, toknum, toklen, linenum, linelen, in_quotes, in_rem, in_deffn, in_spec, lastline;
char **tarrptr;
unsigned char *ptr, *ptr2, *linestart, *outptr, *remptr, *fileptr, *asciiptr;
double num;
int num_exp;
unsigned long num_mantissa, num_ascii;
int textlinenum;
int chk = 0;
int alttok;
int passnum = 1;
FILE *in = stdin, *out = stdout;
strcpy(speccy_filename, "");
strcpy(infile, "-");
strcpy(outfile, DEFAULT_OUTPUT);
parse_options(argc, argv);
if ( zx81mode && !strcmp(outfile, DEFAULT_OUTPUT ) )
outfile[4]= 'p', outfile[5]= 0;
if (strcmp(infile, "-") != 0 && (in = fopen(infile, "r")) == NULL)
fprintf(stderr, "Couldn't open input file.\n"), exit(1);
fileptr = filebuf;
linenum = -1; /* to set lastline */
/* we make one pass if using line numbers, two if using labels */
do {
if (use_labels) linenum = autostart - autoincr;
textlinenum = 0;
if (passnum > 1 && fseek(in, 0L, SEEK_SET) != 0) {
fprintf(stderr, "Need seekable input for label support\n");
exit(1);
}
while (fgets(buf + 1, sizeof (buf) - 1, in) != NULL) {
buf[0] = 32; /* just in case, for all the ptr[-1] stuff */
textlinenum++;
lastline = linenum;
if (buf[strlen(buf) - 1] == '\n') buf[strlen(buf) - 1] = 0;
/* allow for (shell-style) comments which don't appear in the program,
* and also ignore blank lines.
*/
if (buf[1] == 0 || buf[1] == '#') continue;
/* check for line continuation */
while (buf[strlen(buf) - 1] == '\\') {
f = strlen(buf) - 1;
fgets(buf + f, sizeof (buf) - f, in);
textlinenum++;
if (buf[strlen(buf) - 1] == '\n') buf[strlen(buf) - 1] = 0;
}
if (strlen(buf) >= sizeof (buf) - MAX_LABEL_LEN - 1) {
/* this is nasty, but given how the label substitution works it's
* probably the safest thing to do.
*/
fprintf(stderr, "line %d: line too big for input buffer\n", textlinenum);
exit(1);
}
/* get line number (or assign one) */
if (use_labels) {
linestart = buf;
/* assign a line number */
linenum += autoincr;
if (linenum > 9999)
fprintf(stderr, "Generated line number is >9999 - %s\n",
(autostart > 1 || autoincr > 1) ? "try using `-s 1 -i 1'"
: "too many lines!"),
exit(1);
} else {
ptr = buf;
// Skip over spaces
while (isspace(*ptr)) ptr++;
if (!isdigit(*ptr)) {
fprintf(stderr, "line %d: missing line number\n", textlinenum);
exit(1);
}
linenum = (int) strtol(ptr, (char **) &linestart, 10);
if (linenum <= lastline) {
fprintf(stderr, "line %d: line no. not greater than previous one\n",
textlinenum);
exit(1);
}
}
if (linenum < 0 || linenum > 9999) {
fprintf(stderr, "line %d: line no. out of range\n", textlinenum);
exit(1);
}
/* lose remaining spaces */
while (isspace(*linestart)) linestart++;
/* check there's no line numbers on label-using programs */
if (use_labels && isdigit(*linestart)) {
fprintf(stderr, "line %d: line number used in labels mode\n",
textlinenum);
exit(1);
}
if (use_labels && *linestart == '@') {
if ((ptr = strchr(linestart, ':')) == NULL) {
fprintf(stderr, "line %d: incomplete token definition\n", textlinenum);
exit(1);
}
if (ptr - linestart - 1 > MAX_LABEL_LEN) {
fprintf(stderr, "line %d: token too long\n", textlinenum);
exit(1);
}
if (passnum == 1) {
*ptr = 0;
label_lines[labelend] = linenum;
strcpy(labels[labelend++], linestart + 1);
if (labelend >= MAX_LABELS) {
fprintf(stderr, "line %d: too many labels\n", textlinenum);
exit(1);
}
for (f = 0; f < labelend - 1; f++)
if (strcmp(linestart + 1, labels[f]) == 0) {
fprintf(stderr, "iine %d: attempt to redefine label\n", textlinenum);
exit(1);
}
*ptr = ':';
}
linestart = ptr + 1;
while (isspace(*linestart)) linestart++;
/* if now blank, don't bother inserting an actual line here;
* instead, fiddle linenum so the next line will have the
* same number.
*/
if (*linestart == 0) {
linenum -= autoincr;
continue;
}
}
if (use_labels && passnum == 1) continue;
/* make token comparison copy of line. this has lowercase letters and
* blanked-out strings.
*/
ptr = linestart;
in_quotes = 0;
ptr2 = lcasebuf;
while (*ptr) {
if (*ptr == '"') in_quotes = !in_quotes;
if (in_quotes && *ptr != '"')
*ptr2++ = 32;
else
*ptr2++ = tolower(*ptr);
ptr++;
}
*ptr2 = 0;
/* now convert any token without letters either side to the correct
* speccy token number. (Any space this leaves in the string is replaced
* by 0x01 chars.)
*
* However, we need to check for REM first. If found, no token/num stuff
* is performed on the line after that point.
*/
remptr = NULL;
if ((ptr = strstr(lcasebuf, "rem")) != NULL &&
!isalpha(ptr[-1]) && !isalpha(ptr[3])) {
ptr2 = linestart + (ptr - lcasebuf);
/* endpoint for checks must be here, then. */
remptr = ptr2;
*remptr = *ptr = 0;
/* the zero will be replaced with the REM token later */
ptr2[1] = ptr[1] = ptr2[2] = ptr[2] = 1;
/* absorb at most one trailing space */
if (ptr[3] == ' ') ptr2[3] = ptr[3] = 1;
}
// Run through standard tokens table
toknum = zx81mode ? 256 : 151;
alttok = 1;
for (tarrptr = zx81mode ? tokens81 : tokens; *tarrptr != NULL; tarrptr++) {
if (alttok) toknum--;
alttok = !alttok;
if (**tarrptr == 0) continue;
toklen = strlen(*tarrptr);
// Check for table partition splitting special commands from standard commands (Alistair Neil))
if (strcmp(*tarrptr, "-----") == 0) {
toknum = 256;
alttok = 0;
continue;
}
ptr = lcasebuf;
while ((ptr = strstr(ptr, *tarrptr)) != NULL) {
// Check for special commands which dont generate a token (Alistair Neil))
if (*(ptr - 1) == '%' && *tarrptr[0] != '%') {
ptr += toklen;
continue;
}
/* check it's not in the middle of a word etc., except for
* <>, <=, >=.
*/
if ((*tarrptr)[0] == '<' || (*tarrptr)[1] == '=' ||
(!isalpha(ptr[-1]) && !isalpha(ptr[toklen])) && toknum > 150) {
ptr2 = linestart + (ptr - lcasebuf);
/* the token text is overwritten in the lcase copy too, to
* avoid problems with e.g. go to/to.
*/
if( zx81mode && toknum>0xbc && toknum<0xc0 )
*ptr2= *ptr= toknum==0xbe ? 0x7c : toknum-0x40; // RND, INKEY$, PI
else
*ptr2 = *ptr = toknum;
for (f = 1; f < toklen; f++) ptr2[f] = ptr[f] = 1;
/* absorb trailing spaces too */
while (ptr2[f] == ' ')
ptr2[f++] = 1;
/* for BIN, we need the token right before the number. */
if ( !zx81mode && toknum == BIN_TOKEN_NUM) {
*ptr2 = *ptr = 1;
ptr2[f - 1] = ptr[f - 1] = toknum;
}
}
ptr += toklen;
}
}
if (use_labels) {
/* replace @label with matching number.
* this expands labels in strings too, since:
* 1. it seems reasonable to assume you might want this;
* 2. it makes the code a bit simpler :-) ;
* 3. you can use the escape `\@' to get a literal `@' anyway.
*/
ptr = linestart;
while ((ptr = strchr(ptr, '@')) != NULL) {
if (ptr[-1] == '\\') {
ptr++;
continue;
}
/* the easiest way to spot them is to try matching against
* each label in turn. It's gross, but at least it's sane
* and doesn't restrict what you can have as a label.
* We also test that the char after a match is not a printable
* ascii char (other than space or colon), to prevent matches
* against the shorter of two possibilities.
*/
ptr++;
for (f = 0; f < labelend; f++) {
int len = strlen(labels[f]);
if (memcmp(labels[f], ptr, len) == 0 &&
(ptr[len] < 33 || ptr[len] > 126 || ptr[len] == ':')) {
unsigned char numbuf[20];
/* this could be optimised to use a single memmove(), but
* at least this way it's clear(er) what's happening.
*/
/* switch text for label. first, remove text */
memmove(ptr - 1, ptr + len, strlen(ptr + len) + 1);
/* make number string */
sprintf(numbuf, "%d", label_lines[f]);
len = strlen(numbuf);
/* insert room for number string */
ptr--;
memmove(ptr + len, ptr, strlen(ptr) + 1);
if ( zx81mode )
memcpycnv( ptr, numbuf, len );
else
memcpy(ptr, numbuf, len);
ptr += len;
break;
}
}
if (f == labelend) {
fprintf(stderr, "line %d: undefined label\n", textlinenum);
exit(1);
}
}
}
if (remptr)
*remptr = REM_TOKEN_NUM;
/* remove 0x01s, deal with backslash things, and add numbers */
ptr = linestart;
outptr = outbuf;
in_rem = in_deffn = in_quotes = in_spec = 0;
while (*ptr) {
if (outptr > outbuf + sizeof (outbuf) - 10) {
fprintf(stderr, "line %d: line too big\n", textlinenum);
exit(1);
}
if (*ptr == '"')
in_quotes = !in_quotes;
/* as well as 0x01 chars, we skip tabs. */
// Modified to recognise special commands using in_spec flag (Alistair Neil)
else if (*ptr == 1 || *ptr == 9 || (!in_quotes && !in_rem && !in_spec && *ptr == ' ')) {
ptr++;
continue;
}
else if ( *ptr == DEFFN_TOKEN_NUM )
in_deffn = 1;
else if ( *ptr == REM_TOKEN_NUM )
in_rem = 1;
// Check for special commands at the beginning of a line and insert a space (Alistair Neil)
else if (*ptr == '%' && !in_rem && !in_quotes) {
// Check for certain commands that need to skip number processing (Alistair Neil)
in_spec = 1;
if (ptr == linestart) *outptr++ = ' ';
}
else if (*ptr == '\\') {
if (isalpha(ptr[1]) && strchr("VWXYZvwxyz", ptr[1]) == NULL)
*outptr++ = 144 + tolower(ptr[1]) - 'a';
else if( zx81mode )
switch( ptr[1] ){
case '0': case '1': case '2': case '3': case '4': /* inverted digits */
case '5': case '6': case '7': case '8': case '9':
*outptr++= ptr[1]+108; break;
case '"': *outptr++=0x8b; break;
case '$': *outptr++=0x8d; break;
case ':':
if( strchr("'.: ",ptr[2])==NULL )
*outptr++=0x8e;
else
*outptr++= grok_block(ptr,textlinenum),
ptr++;
break;
case '?': *outptr++=0x8f; break;
case '(': *outptr++=0x90; break;
case ')': *outptr++=0x91; break;
case '>': *outptr++=0x92; break;
case '<': *outptr++=0x93; break;
case '=': *outptr++=0x94; break;
case '+': *outptr++=0x95; break;
case '-': *outptr++=0x96; break;
case '*': *outptr++=0x97; break;
case '/': *outptr++=0x98; break;
case ';': *outptr++=0x99; break;
case ',': *outptr++=0x9a; break;