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116 lines
2.5 KiB
116 lines
2.5 KiB
#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <map.h>
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static const char* _prog_name = "fcmp";
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#ifdef DEBUG
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#define __name(d) #d
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#define dprintf(fmt, ...) printf("[dbg @" __FILE__ "->%s:%d] " fmt "\n", __func__, __LINE__ __VA_OPT__(,) __VA_ARGS__)
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#else
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#define dprintf(fmt, ...)
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#endif
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__attribute__((noreturn)) static void usage()
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{
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fprintf(stderr, "fcmp: compare files for identity\n");
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fprintf(stderr, "usage: %s <files...>\n", _prog_name);
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exit(-1);
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}
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__attribute__((always_inline)) static inline const void* die_if_null(const void* ptr)
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{
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if (!ptr) usage();
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else return ptr;
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}
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static int unmap_all(mmap_t ptrs[], size_t len)
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{
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register int rval=1;
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dprintf("Unmapping %lu entries", len);
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for (register size_t i=0;i<len;i++)
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{
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if(!unmap_and_close(ptrs[i])) {
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fprintf(stderr, "Failed to unmap and close fd %d", ptrs[i].fd);
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rval = -1;
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}
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}
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return rval;
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}
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static int compare_then_close(const mmap_t * restrict map1, mmap_t map2)
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{
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register int rval=0;
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if (map1->len != map2.len) rval = 2;
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else if (memcmp(map1->ptr, map2.ptr, map1->len) != 0) rval = 1;
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if(!unmap_and_close(map2)) {
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fprintf(stderr, "Failed to unmap and close");
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rval=-1;
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}
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return rval;
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}
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int main(int argc, char** argv)
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{
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_prog_name = argv[0];
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const int nrest = argc-2;
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if (nrest==0) usage();
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dprintf("There are %d extra files to chk", nrest);
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const char* f1 = die_if_null(argv[1]);
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const char* frest[nrest];
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for (register int i=0;i<nrest;i++) {
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frest[i] = die_if_null(argv[2+i]);
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dprintf("frest[%d] = \"%s\"", i, frest[i]);
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}
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mmap_t map1;
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mmap_t mrest[nrest];
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if (!open_and_map(f1, &map1)) {
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fprintf(stderr, "Failed to open or map %s\n", f1);
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return -1;
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}
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for(register int i=0;i<nrest;i++) {
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const char* f2 = frest[i];
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dprintf("Attempting to map %d (%s)", i, f2);
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if (!open_and_map(f2, &mrest[i])) {
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fprintf(stderr, "Failed to open or map arg %d, `%s`\n", i+2, f2);
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unmap_and_close(map1);
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unmap_all(mrest, i);
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return -1;
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}
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}
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dprintf("All map okay");
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register int rval=0;
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for(register int i=0;i<nrest;i++) {
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dprintf("Checking %d \"%s\"", i, frest[i]);
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switch ((rval=compare_then_close(&map1, mrest[i]))) {
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case 0: break;
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default:
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// Close the rest
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dprintf("Unmapping mrest from %d (len %d) while max of nrest is %d", (i+1), nrest-(i+1), nrest);
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if(i<nrest-1) unmap_all(mrest+ (i+1), nrest- (i+1));
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goto end;
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}
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dprintf("Ident %d OK", i);
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}
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end:
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if(!unmap_and_close(map1)) {
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fprintf(stderr, "Failed to unmap and close %s", f1);
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rval=-1;
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}
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dprintf("Final rval is %d", rval);
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return rval;
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}
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