70 lines
1.2 KiB
C
Executable File
70 lines
1.2 KiB
C
Executable File
#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#ifndef S_ISREG
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#ifndef S_IFREG
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#define S_IFREG _S_IFREG
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#endif
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#ifndef S_IFMT
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#define S_IFMT _S_IFMT
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#endif
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#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
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#endif /* not S_ISREG */
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#ifndef O_BINARY
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#ifdef _O_BINARY
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#define O_BINARY _O_BINARY
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#else
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#define O_BINARY 0
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#endif
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#endif
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int filemap(const char *name,
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void (*processor)(const void *, size_t, const char *, void *arg),
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void *arg)
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{
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size_t nbytes;
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int fd;
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int n;
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struct stat sb;
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void *p;
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fd = open(name, O_RDONLY|O_BINARY);
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if (fd < 0) {
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perror(name);
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return 0;
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}
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if (fstat(fd, &sb) < 0) {
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perror(name);
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return 0;
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}
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if (!S_ISREG(sb.st_mode)) {
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fprintf(stderr, "%s: not a regular file\n", name);
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return 0;
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}
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nbytes = sb.st_size;
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p = malloc(nbytes);
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if (!p) {
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fprintf(stderr, "%s: out of memory\n", name);
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return 0;
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}
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n = _read(fd, p, nbytes);
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if (n < 0) {
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perror(name);
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close(fd);
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return 0;
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}
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if (n != nbytes) {
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fprintf(stderr, "%s: read unexpected number of bytes\n", name);
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close(fd);
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return 0;
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}
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processor(p, nbytes, name, arg);
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free(p);
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close(fd);
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return 1;
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}
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