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Be clearer about error reporting
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@ -137,7 +137,7 @@ int indexcmp(const void *v1, const void *v2) {
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size_t fwrite_check(const void *ptr, size_t size, size_t nitems, FILE *stream) {
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size_t w = fwrite(ptr, size, nitems, stream);
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if (w != nitems) {
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fprintf(stderr, "Write failed\n");
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fprintf(stderr, "Write failed: %s\n", strerror(errno));
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exit(EXIT_FAILURE);
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}
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return w;
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