48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
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#ifndef DAT_PATHS_H
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#define DAT_PATHS_H
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef _WIN32
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#include <windows.h>
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#endif
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/* Return the user's home directory across POSIX shells and native Windows
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* launches. Windows GUI starts commonly have USERPROFILE but no HOME. */
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static inline const char *dat_home_directory(void)
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{
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const char *home = getenv("HOME");
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if (home && *home) return home;
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#ifdef _WIN32
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home = getenv("USERPROFILE");
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if (home && *home) return home;
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{
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const char *drive = getenv("HOMEDRIVE");
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const char *path = getenv("HOMEPATH");
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static char combined[1024];
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int n;
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if (!drive || !*drive || !path || !*path) return NULL;
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n = snprintf(combined, sizeof(combined), "%s%s", drive, path);
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return n >= 0 && (size_t)n < sizeof(combined) ? combined : NULL;
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}
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#else
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return NULL;
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#endif
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}
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/* POSIX rename replaces an existing file; Windows rename does not. These
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* state files are written to a sibling temporary file before replacement. */
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static inline int dat_replace_file(const char *temporary, const char *destination)
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{
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#ifdef _WIN32
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if (MoveFileExA(temporary, destination,
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MOVEFILE_REPLACE_EXISTING | MOVEFILE_WRITE_THROUGH)) return 0;
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errno = EIO;
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return -1;
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#else
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return rename(temporary, destination);
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#endif
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}
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#endif
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