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7b7f974e42
SqMod/vendor/Squirrel/stdlib/sqstdstring.cpp
Sandu Liviu Catalin 4a6bfc086c Major plugin refactor and cleanup. 
Switched to POCO library for unified platform/library interface.
Deprecated the external module API. It was creating more problems than solving.
Removed most built-in libraries in favor of system libraries for easier maintenance.
Cleaned and secured code with help from static analyzers.
2021-01-30 08:51:39 +02:00

539 lines
14 KiB
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/* see copyright notice in squirrel.h */
#include <squirrel.h>
#include <sqstdstring.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <assert.h>
#include <stdarg.h>
#define MAX_FORMAT_LEN 20
#define MAX_WFORMAT_LEN 3
#define ADDITIONAL_FORMAT_SPACE (100*sizeof(SQChar))
static SQBool isfmtchr(SQChar ch)
{
switch(ch) {
case '-': case '+': case ' ': case '#': case '0': return SQTrue;
}
return SQFalse;
}
static SQInteger validate_format(HSQUIRRELVM v, SQChar *fmt, const SQChar *src, SQInteger n,SQInteger &width)
{
SQChar *dummy;
SQChar swidth[MAX_WFORMAT_LEN];
SQInteger wc = 0;
SQInteger start = n;
fmt[0] = '%';
while (isfmtchr(src[n])) n++;
while (scisdigit(src[n])) {
swidth[wc] = src[n];
n++;
wc++;
if(wc>=MAX_WFORMAT_LEN)
return sq_throwerror(v,_SC("width format too long"));
}
swidth[wc] = '\0';
if(wc > 0) {
width = scstrtol(swidth,&dummy,10);
}
else
width = 0;
if (src[n] == '.') {
n++;
wc = 0;
while (scisdigit(src[n])) {
swidth[wc] = src[n];
n++;
wc++;
if(wc>=MAX_WFORMAT_LEN)
return sq_throwerror(v,_SC("precision format too long"));
}
swidth[wc] = '\0';
if(wc > 0) {
width += scstrtol(swidth,&dummy,10);
}
}
if (n-start > MAX_FORMAT_LEN )
return sq_throwerror(v,_SC("format too long"));
memcpy(&fmt[1],&src[start],((n-start)+1)*sizeof(SQChar));
fmt[(n-start)+2] = '\0';
return n;
}
SQRESULT sqstd_format(HSQUIRRELVM v,SQInteger nformatstringidx,SQInteger *outlen,SQChar **output)
{
const SQChar *format;
SQChar *dest;
SQChar fmt[MAX_FORMAT_LEN];
const SQRESULT res = sq_getstring(v,nformatstringidx,&format);
if (SQ_FAILED(res)) {
return res; // propagate the error
}
SQInteger format_size = sq_getsize(v,nformatstringidx);
SQInteger allocated = (format_size+2)*sizeof(SQChar);
dest = sq_getscratchpad(v,allocated);
SQInteger n = 0,i = 0, nparam = nformatstringidx+1, w = 0;
//while(format[n] != '\0')
while(n < format_size)
{
if(format[n] != '%') {
assert(i < allocated);
dest[i++] = format[n];
n++;
}
else if(format[n+1] == '%') { //handles %%
dest[i++] = '%';
n += 2;
}
else {
n++;
if( nparam > sq_gettop(v) )
return sq_throwerror(v,_SC("not enough parameters for the given format string"));
n = validate_format(v,fmt,format,n,w);
if(n < 0) return -1;
SQInteger addlen = 0;
SQInteger valtype = 0;
const SQChar *ts = NULL;
SQInteger ti = 0;
SQFloat tf = 0;
switch(format[n]) {
case 's':
if(SQ_FAILED(sq_getstring(v,nparam,&ts)))
return sq_throwerror(v,_SC("string expected for the specified format"));
addlen = (sq_getsize(v,nparam)*sizeof(SQChar))+((w+1)*sizeof(SQChar));
valtype = 's';
break;
case 'i': case 'd': case 'o': case 'u': case 'x': case 'X':
#ifdef _SQ64
{
size_t flen = scstrlen(fmt);
SQInteger fpos = flen - 1;
SQChar f = fmt[fpos];
const SQChar *prec = (const SQChar *)_PRINT_INT_PREC;
while(*prec != _SC('\0')) {
fmt[fpos++] = *prec++;
}
fmt[fpos++] = f;
fmt[fpos++] = _SC('\0');
}
#endif
case 'c':
if(SQ_FAILED(sq_getinteger(v,nparam,&ti)))
return sq_throwerror(v,_SC("integer expected for the specified format"));
addlen = (ADDITIONAL_FORMAT_SPACE)+((w+1)*sizeof(SQChar));
valtype = 'i';
break;
case 'f': case 'g': case 'G': case 'e': case 'E':
if(SQ_FAILED(sq_getfloat(v,nparam,&tf)))
return sq_throwerror(v,_SC("float expected for the specified format"));
addlen = (ADDITIONAL_FORMAT_SPACE)+((w+1)*sizeof(SQChar));
valtype = 'f';
break;
default:
return sq_throwerror(v,_SC("invalid format"));
}
n++;
allocated += addlen + sizeof(SQChar);
dest = sq_getscratchpad(v,allocated);
switch(valtype) {
case 's': i += scsprintf(&dest[i],allocated,fmt,ts); break;
case 'i': i += scsprintf(&dest[i],allocated,fmt,ti); break;
case 'f': i += scsprintf(&dest[i],allocated,fmt,tf); break;
};
nparam ++;
}
}
*outlen = i;
dest[i] = '\0';
*output = dest;
return SQ_OK;
}
void sqstd_pushstringf(HSQUIRRELVM v,const SQChar *s,...)
{
SQInteger n=256;
va_list args;
begin:
va_start(args,s);
SQChar *b=sq_getscratchpad(v,n);
SQInteger r=scvsprintf(b,n,s,args);
va_end(args);
if (r>=n) {
n=r+1;//required+null
goto begin;
} else if (r<0) {
sq_pushnull(v);
} else {
sq_pushstring(v,b,r);
}
}
static SQInteger _string_printf(HSQUIRRELVM v)
{
SQChar *dest = NULL;
SQInteger length = 0;
if(SQ_FAILED(sqstd_format(v,2,&length,&dest)))
return -1;
SQPRINTFUNCTION printfunc = sq_getprintfunc(v);
if(printfunc) printfunc(v,_SC("%s"),dest);
return 0;
}
static SQInteger _string_format(HSQUIRRELVM v)
{
SQChar *dest = NULL;
SQInteger length = 0;
if(SQ_FAILED(sqstd_format(v,2,&length,&dest)))
return -1;
sq_pushstring(v,dest,length);
return 1;
}
static void __strip_l(const SQChar *str,const SQChar **start)
{
const SQChar *t = str;
while(((*t) != '\0') && scisspace(*t)){ t++; }
*start = t;
}
static void __strip_r(const SQChar *str,SQInteger len,const SQChar **end)
{
if(len == 0) {
*end = str;
return;
}
const SQChar *t = &str[len-1];
while(t >= str && scisspace(*t)) { t--; }
*end = t + 1;
}
static SQInteger _string_strip(HSQUIRRELVM v)
{
const SQChar *str,*start,*end;
sq_getstring(v,2,&str);
SQInteger len = sq_getsize(v,2);
__strip_l(str,&start);
__strip_r(str,len,&end);
sq_pushstring(v,start,end - start);
return 1;
}
static SQInteger _string_lstrip(HSQUIRRELVM v)
{
const SQChar *str,*start;
sq_getstring(v,2,&str);
__strip_l(str,&start);
sq_pushstring(v,start,-1);
return 1;
}
static SQInteger _string_rstrip(HSQUIRRELVM v)
{
const SQChar *str,*end;
sq_getstring(v,2,&str);
SQInteger len = sq_getsize(v,2);
__strip_r(str,len,&end);
sq_pushstring(v,str,end - str);
return 1;
}
static SQInteger _string_split(HSQUIRRELVM v)
{
const SQChar *str,*seps;
SQChar *stemp;
sq_getstring(v,2,&str);
sq_getstring(v,3,&seps);
SQInteger sepsize = sq_getsize(v,3);
if(sepsize == 0) return sq_throwerror(v,_SC("empty separators string"));
SQInteger memsize = (sq_getsize(v,2)+1)*sizeof(SQChar);
stemp = sq_getscratchpad(v,memsize);
memcpy(stemp,str,memsize);
SQChar *start = stemp;
SQChar *end = stemp;
sq_newarray(v,0);
while(*end != '\0')
{
SQChar cur = *end;
for(SQInteger i = 0; i < sepsize; i++)
{
if(cur == seps[i])
{
*end = 0;
sq_pushstring(v,start,-1);
sq_arrayappend(v,-2);
start = end + 1;
break;
}
}
end++;
}
if(end != start)
{
sq_pushstring(v,start,-1);
sq_arrayappend(v,-2);
}
return 1;
}
static SQInteger _string_escape(HSQUIRRELVM v)
{
const SQChar *str;
SQChar *dest,*resstr;
SQInteger size;
sq_getstring(v,2,&str);
size = sq_getsize(v,2);
if(size == 0) {
sq_push(v,2);
return 1;
}
#ifdef SQUNICODE
#if WCHAR_SIZE == 2
const SQChar *escpat = _SC("\\x%04x");
const SQInteger maxescsize = 6;
#else //WCHAR_SIZE == 4
const SQChar *escpat = _SC("\\x%08x");
const SQInteger maxescsize = 10;
#endif
#else
const SQChar *escpat = _SC("\\x%02x");
const SQInteger maxescsize = 4;
#endif
SQInteger destcharsize = (size * maxescsize); //assumes every char could be escaped
resstr = dest = (SQChar *)sq_getscratchpad(v,destcharsize * sizeof(SQChar));
SQChar c;
SQChar escch;
SQInteger escaped = 0;
for(int n = 0; n < size; n++){
c = *str++;
escch = 0;
if(scisprint(c) || c == 0) {
switch(c) {
case '\a': escch = 'a'; break;
case '\b': escch = 'b'; break;
case '\t': escch = 't'; break;
case '\n': escch = 'n'; break;
case '\v': escch = 'v'; break;
case '\f': escch = 'f'; break;
case '\r': escch = 'r'; break;
case '\\': escch = '\\'; break;
case '\"': escch = '\"'; break;
case '\'': escch = '\''; break;
case 0: escch = '0'; break;
}
if(escch) {
*dest++ = '\\';
*dest++ = escch;
escaped++;
}
else {
*dest++ = c;
}
}
else {
dest += scsprintf(dest, destcharsize, escpat, c);
escaped++;
}
}
if(escaped) {
sq_pushstring(v,resstr,dest - resstr);
}
else {
sq_push(v,2); //nothing escaped
}
return 1;
}
static SQInteger _string_startswith(HSQUIRRELVM v)
{
const SQChar *str,*cmp;
sq_getstring(v,2,&str);
sq_getstring(v,3,&cmp);
SQInteger len = sq_getsize(v,2);
SQInteger cmplen = sq_getsize(v,3);
SQBool ret = SQFalse;
if(cmplen <= len) {
ret = memcmp(str,cmp,sq_rsl(cmplen)) == 0 ? SQTrue : SQFalse;
}
sq_pushbool(v,ret);
return 1;
}
static SQInteger _string_endswith(HSQUIRRELVM v)
{
const SQChar *str,*cmp;
sq_getstring(v,2,&str);
sq_getstring(v,3,&cmp);
SQInteger len = sq_getsize(v,2);
SQInteger cmplen = sq_getsize(v,3);
SQBool ret = SQFalse;
if(cmplen <= len) {
ret = memcmp(&str[len - cmplen],cmp,sq_rsl(cmplen)) == 0 ? SQTrue : SQFalse;
}
sq_pushbool(v,ret);
return 1;
}
#define SETUP_REX(v) \
SQRex *self = NULL; \
sq_getinstanceup(v,1,(SQUserPointer *)&self,0);
static SQInteger _rexobj_releasehook(SQUserPointer p, SQInteger SQ_UNUSED_ARG(size))
{
SQRex *self = ((SQRex *)p);
sqstd_rex_free(self);
return 1;
}
static SQInteger _regexp_match(HSQUIRRELVM v)
{
SETUP_REX(v);
const SQChar *str;
sq_getstring(v,2,&str);
if(sqstd_rex_match(self,str) == SQTrue)
{
sq_pushbool(v,SQTrue);
return 1;
}
sq_pushbool(v,SQFalse);
return 1;
}
static void _addrexmatch(HSQUIRRELVM v,const SQChar *str,const SQChar *begin,const SQChar *end)
{
sq_newtable(v);
sq_pushstring(v,_SC("begin"),-1);
sq_pushinteger(v,begin - str);
sq_rawset(v,-3);
sq_pushstring(v,_SC("end"),-1);
sq_pushinteger(v,end - str);
sq_rawset(v,-3);
}
static SQInteger _regexp_search(HSQUIRRELVM v)
{
SETUP_REX(v);
const SQChar *str,*begin,*end;
SQInteger start = 0;
sq_getstring(v,2,&str);
if(sq_gettop(v) > 2) sq_getinteger(v,3,&start);
if(sqstd_rex_search(self,str+start,&begin,&end) == SQTrue) {
_addrexmatch(v,str,begin,end);
return 1;
}
return 0;
}
static SQInteger _regexp_capture(HSQUIRRELVM v)
{
SETUP_REX(v);
const SQChar *str,*begin,*end;
SQInteger start = 0;
sq_getstring(v,2,&str);
if(sq_gettop(v) > 2) sq_getinteger(v,3,&start);
if(sqstd_rex_search(self,str+start,&begin,&end) == SQTrue) {
SQInteger n = sqstd_rex_getsubexpcount(self);
SQRexMatch match;
sq_newarray(v,0);
for(SQInteger i = 0;i < n; i++) {
sqstd_rex_getsubexp(self,i,&match);
if(match.len > 0)
_addrexmatch(v,str,match.begin,match.begin+match.len);
else
_addrexmatch(v,str,str,str); //empty match
sq_arrayappend(v,-2);
}
return 1;
}
return 0;
}
static SQInteger _regexp_subexpcount(HSQUIRRELVM v)
{
SETUP_REX(v);
sq_pushinteger(v,sqstd_rex_getsubexpcount(self));
return 1;
}
static SQInteger _regexp_constructor(HSQUIRRELVM v)
{
const SQChar *error,*pattern;
sq_getstring(v,2,&pattern);
SQRex *rex = sqstd_rex_compile(pattern,&error);
if(!rex) return sq_throwerror(v,error);
sq_setinstanceup(v,1,rex);
sq_setreleasehook(v,1,_rexobj_releasehook);
return 0;
}
static SQInteger _regexp__typeof(HSQUIRRELVM v)
{
sq_pushstring(v,_SC("regexp"),-1);
return 1;
}
#define _DECL_REX_FUNC(name,nparams,pmask) {_SC(#name),_regexp_##name,nparams,pmask}
static const SQRegFunction rexobj_funcs[]={
_DECL_REX_FUNC(constructor,2,_SC(".s")),
_DECL_REX_FUNC(search,-2,_SC("xsn")),
_DECL_REX_FUNC(match,2,_SC("xs")),
_DECL_REX_FUNC(capture,-2,_SC("xsn")),
_DECL_REX_FUNC(subexpcount,1,_SC("x")),
_DECL_REX_FUNC(_typeof,1,_SC("x")),
{NULL,(SQFUNCTION)0,0,NULL}
};
#undef _DECL_REX_FUNC
#define _DECL_FUNC(name,nparams,pmask) {_SC(#name),_string_##name,nparams,pmask}
static const SQRegFunction stringlib_funcs[]={
_DECL_FUNC(format,-2,_SC(".s")),
_DECL_FUNC(printf,-2,_SC(".s")),
_DECL_FUNC(strip,2,_SC(".s")),
_DECL_FUNC(lstrip,2,_SC(".s")),
_DECL_FUNC(rstrip,2,_SC(".s")),
_DECL_FUNC(split,3,_SC(".ss")),
_DECL_FUNC(escape,2,_SC(".s")),
_DECL_FUNC(startswith,3,_SC(".ss")),
_DECL_FUNC(endswith,3,_SC(".ss")),
{NULL,(SQFUNCTION)0,0,NULL}
};
#undef _DECL_FUNC
SQInteger sqstd_register_stringlib(HSQUIRRELVM v)
{
sq_pushstring(v,_SC("regexp"),-1);
sq_newclass(v,SQFalse);
SQInteger i = 0;
while(rexobj_funcs[i].name != 0) {
const SQRegFunction &f = rexobj_funcs[i];
sq_pushstring(v,f.name,-1);
sq_newclosure(v,f.f,0);
sq_setparamscheck(v,f.nparamscheck,f.typemask);
sq_setnativeclosurename(v,-1,f.name);
sq_newslot(v,-3,SQFalse);
i++;
}
sq_newslot(v,-3,SQFalse);
i = 0;
while(stringlib_funcs[i].name!=0)
{
sq_pushstring(v,stringlib_funcs[i].name,-1);
sq_newclosure(v,stringlib_funcs[i].f,0);
sq_setparamscheck(v,stringlib_funcs[i].nparamscheck,stringlib_funcs[i].typemask);
sq_setnativeclosurename(v,-1,stringlib_funcs[i].name);
sq_newslot(v,-3,SQFalse);
i++;
}
return 1;
}
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