forked from KolibriOS/kolibrios
90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
#include "stdio.h"
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#include "string.h"
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FILE* fopen(const char* filename, const char *mode)
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{
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FILE* res;
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int imode;
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imode=0;
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if (*mode=='r')
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{
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imode=FILE_OPEN_READ;
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mode++;
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}else if (*mode=='w')
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{
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imode=FILE_OPEN_WRITE;
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mode++;
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}else if (*mode=='a')
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{
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imode=FILE_OPEN_APPEND;
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mode++;
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}else
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return 0;
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if (*mode=='t')
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{
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imode|=FILE_OPEN_TEXT;
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mode++;
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}else if (*mode=='b')
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mode++;
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if (*mode=='+')
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{
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imode|=FILE_OPEN_PLUS;
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mode++;
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}
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if (*mode!=0)
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return 0;
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res=malloc(sizeof(FILE));
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res->buffer=0;
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res->buffersize=0;
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res->filesize=0;
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res->filepos=0;
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res->filename=0;
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res->mode=imode;
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//check if file exists
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res=_msys_read_file(filename,0,0,0,&res->filesize);
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if (res==5)
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{
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if ((imode & 3) == FILE_OPEN_READ)
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{
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free(res);
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return 0;
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}
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res=_msys_write_file(filename,0,0);
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if (res!=0)
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{
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free(res);
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return 0;
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}
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res->filesize=0;
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}
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if (imode & 3==FILE_OPEN_WRITE)
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{
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res->buffersize=512;
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res->buffer=malloc(res->buffersize);
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if (res->buffer=0)
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{
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free(res);
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return 0;
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}
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res->filesize=0;
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}else
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{
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res->buffersize=(res->filesize & (~511))+512;
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res->buffer=malloc(res->buffersize);
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if (res->buffer==0)
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{
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free(res);
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return 0;
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}
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res=_msys_read_file(filename,0,res->filesize,res->buffer,0);
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if (res!=0)
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{
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free(res->buffer);
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free(res);
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}
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if (imode & 3==FILE_OPEN_APPEND)
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res->filepos=res->filesize;
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}
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res->filename=strdup(filename);
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return res;
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}
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