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Use time_t for save signature 

It's actually more likely to be 64-bit than size_t anyway, and it
eliminates some helper functions.

Also don't error when reading an empty save file.
master
C. McEnroe 2020-02-11 18:01:50 -05:00
parent cc80fae758
commit c9590bab06
1 changed files with 11 additions and 15 deletions
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26
ui.c
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@ -885,20 +885,17 @@ void uiRead(void) {
inputUpdate();
}
static const size_t Signatures[] = {
static const time_t Signatures[] = {
0x6C72696774616301,
};
static size_t signatureVersion(size_t signature) {
static size_t signatureVersion(time_t signature) {
for (size_t i = 0; i < ARRAY_LEN(Signatures); ++i) {
if (signature == Signatures[i]) return i;
}
err(EX_DATAERR, "unknown file signature %zX", signature);
err(EX_DATAERR, "unknown file signature %jX", (uintmax_t)signature);
}
static int writeSize(FILE *file, size_t value) {
return (fwrite(&value, sizeof(value), 1, file) ? 0 : -1);
}
static int writeTime(FILE *file, time_t time) {
return (fwrite(&time, sizeof(time), 1, file) ? 0 : -1);
}
@ -910,7 +907,7 @@ int uiSave(const char *name) {
FILE *file = dataOpen(name, "w");
if (!file) return -1;
if (writeSize(file, Signatures[0])) return -1;
if (writeTime(file, Signatures[0])) return -1;
const struct Window *window;
for (window = windows.head; window; window = window->next) {
if (writeString(file, idNames[window->id])) return -1;
@ -926,13 +923,6 @@ int uiSave(const char *name) {
return fclose(file);
}
static size_t readSize(FILE *file) {
size_t value;
fread(&value, sizeof(value), 1, file);
if (ferror(file)) err(EX_IOERR, "fread");
if (feof(file)) errx(EX_DATAERR, "unexpected eof");
return value;
}
static time_t readTime(FILE *file) {
time_t time;
fread(&time, sizeof(time), 1, file);
@ -956,7 +946,13 @@ void uiLoad(const char *name) {
return;
}
size_t signature = readSize(file);
time_t signature;
fread(&signature, sizeof(signature), 1, file);
if (ferror(file)) err(EX_IOERR, "fread");
if (feof(file)) {
fclose(file);
return;
}
signatureVersion(signature);
char *buf = NULL;