145 lines
2.8 KiB
C
145 lines
2.8 KiB
C
/*
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* This file is subject to the terms of the GFX License. If a copy of
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* the license was not distributed with this file, you can obtain one at:
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*
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* http://ugfx.io/license.html
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*/
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/********************************************************
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* The virtual string file
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********************************************************/
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#include "../../gfx.h"
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#if GFX_USE_GFILE && GFILE_NEED_STRINGS
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#include "gfile_fs.h"
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#include <string.h>
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// Special String VMT
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static int StringRead(GFILE *f, void *buf, int size) {
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int res;
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char *p;
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if (!f->obj)
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return 0;
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p = ((char *)f->obj) + f->pos;
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for(res = 0; res < size && *p; res++, p++, buf = ((char *)buf)+1)
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((char *)buf)[0] = *p;
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return res;
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}
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static int StringWrite(GFILE *f, const void *buf, int size) {
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if (!f->obj)
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return 0;
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if ((f->flags & GFILEFLG_APPEND)) {
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while(((char *)f->obj)[f->pos])
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f->pos++;
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}
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memcpy(((char *)f->obj)+f->pos, buf, size);
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((char *)f->obj)[f->pos+size] = 0;
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return size;
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}
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static const GFILEVMT StringVMT = {
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0, // flags
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'_', // prefix
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0, 0, 0, 0,
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0, 0, StringRead, StringWrite,
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0, 0, 0,
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0, 0, 0,
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#if GFILE_NEED_FILELISTS
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0, 0, 0,
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#endif
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};
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static void gfileOpenStringFromStaticGFILE(GFILE *f, char *str) {
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if ((f->flags & GFILEFLG_TRUNC) && str)
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str[0] = 0;
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f->vmt = &StringVMT;
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f->obj = str;
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f->pos = 0;
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f->flags |= GFILEFLG_OPEN|GFILEFLG_CANSEEK;
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}
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GFILE *gfileOpenString(char *str, const char *mode) {
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GFILE *f;
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// Get an empty file and set the flags
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if (!str || !(f = _gfileFindSlot(mode)))
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return 0;
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// File is open - fill in all the details
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gfileOpenStringFromStaticGFILE(f, str);
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return f;
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}
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#if GFILE_NEED_PRINTG
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int snprintg(char *buf, int maxlen, const char *fmt, ...) {
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int res;
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GFILE f;
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va_list ap;
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if (maxlen <= 1) {
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if (maxlen == 1) {
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*buf = 0;
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return 0;
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}
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maxlen += 1;
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}
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f.flags = GFILEFLG_WRITE|GFILEFLG_TRUNC;
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gfileOpenStringFromStaticGFILE(&f, buf);
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va_start(ap, fmt);
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res = vfnprintg(&f, maxlen-1, fmt, ap);
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va_end(ap);
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return res;
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}
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int vsnprintg(char *buf, int maxlen, const char *fmt, va_list arg) {
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GFILE f;
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if (maxlen <= 1) {
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if (maxlen == 1) {
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*buf = 0;
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return 0;
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}
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maxlen += 1;
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}
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f.flags = GFILEFLG_WRITE|GFILEFLG_TRUNC;
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gfileOpenStringFromStaticGFILE(&f, buf);
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return vfnprintg(&f, maxlen-1, fmt, arg);
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}
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#endif
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#if GFILE_NEED_SCANG
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int sscang(const char *buf, const char *fmt, ...) {
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int res;
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GFILE f;
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va_list ap;
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f.flags = GFILEFLG_READ;
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gfileOpenStringFromStaticGFILE(&f, (char *)buf);
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va_start(ap, fmt);
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res = vfscang(&f, fmt, ap);
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va_end(ap);
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return res;
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}
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int vsscang(const char *buf, const char *fmt, va_list arg) {
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GFILE f;
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f.flags = GFILEFLG_READ;
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gfileOpenStringFromStaticGFILE(&f, (char *)buf);
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return vfscang(&f, fmt, arg);
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}
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#endif
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#endif //GFX_USE_GFILE && GFILE_NEED_STRINGS
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