54 lines
984 B
C
54 lines
984 B
C
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <stddef.h>
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#include <unistd.h>
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#include "s8slice.h"
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#include <stdio.h>
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#include "os.h"
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S8Slice os_open_file(S8Slice path, os_open_flags flags)
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{
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int oflag = 0;
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switch (flags & (OS_ALLFLAGS)) {
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case OS_READ:
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oflag = O_RDONLY;
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break;
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case OS_WRITE:
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oflag = O_WRONLY;
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break;
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case OS_READ | OS_WRITE:
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oflag = O_RDWR;
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}
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int fd = open((const char*)path.data, oflag);
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if (fd == -1) {
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goto open_fail;
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}
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struct stat st;
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int ok = fstat(fd, &st);
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if (ok == -1) {
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goto fstat_fail;
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}
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int prot = 0;
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if (flags & OS_READ) prot |= PROT_READ;
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if (flags & OS_WRITE) prot |= PROT_WRITE;
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void *x = mmap(NULL, st.st_size, prot, MAP_SHARED, fd, 0);
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if (x == MAP_FAILED) {
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goto mmap_fail;
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}
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close(fd);
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return (S8Slice){.data = x, .len = (int64_t)st.st_size};
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mmap_fail:
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fstat_fail:
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close(fd);
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open_fail:
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return (S8Slice){.len = -1, .data = (uint8_t*)"<open_file error type>"};
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}
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