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36 lines
757 B
C
36 lines
757 B
C
#define _POSIX_C_SOURCE 200809
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#define _ATFILE_SOURCE
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#include <sys/types.h>
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#ifndef _WIN32
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include "open.h"
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#endif
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#include "mmap.h"
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extern const char* mmap_readat(const char* filename,size_t * filesize,int dirfd) {
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#ifdef _WIN32
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return 0;
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#else
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int fd=openat(dirfd,filename,O_RDONLY);
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char *map;
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if (fd>=0) {
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register off_t o=lseek(fd,0,SEEK_END);
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if (o==0 || (sizeof(off_t)!=sizeof(size_t) && o > (off_t)(size_t)-1)) { close(fd); return 0; }
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*filesize=(size_t)o;
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if (o>0) {
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map=mmap(0,*filesize,PROT_READ,MAP_SHARED,fd,0);
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if (map==(char*)-1)
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map=0;
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} else
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map="";
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close(fd);
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return map;
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}
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return 0;
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#endif
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}
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