diff options
Diffstat (limited to 'save-xml.c')
| -rw-r--r-- | save-xml.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/save-xml.c b/save-xml.c index 7bb2642bd..a95487313 100644 --- a/save-xml.c +++ b/save-xml.c @@ -577,12 +577,46 @@ void save_dives_buffer(struct membuffer *b, const bool select_only) put_format(b, "</dives>\n</divelog>\n"); } +static void save_backup(const char *name, const char *ext, const char *new_ext) +{ + int len = strlen(name); + int a = strlen(ext), b = strlen(new_ext); + char *newname; + + /* len up to and including the final '.' */ + len -= a; + if (len <= 1) + return; + if (name[len-1] != '.') + return; + /* msvc doesn't have strncasecmp, has _strnicmp instead - crazy */ + if (strncasecmp(name+len, ext, a)) + return; + + newname = malloc(len + b + 1); + if (!newname) + return; + + memcpy(newname, name, len); + memcpy(newname+len, new_ext, b+1); + + /* + * Ignore errors. Maybe we can't create the backup file, + * maybe no old file existed. Regardless, we'll write the + * new file. + */ + subsurface_rename(name, newname); + free(newname); +} + void save_dives_logic(const char *filename, const bool select_only) { struct membuffer buf = {0}; FILE *f; save_dives_buffer(&buf, select_only); + /* Maybe we might want to make this configurable? */ + save_backup(filename, "xml", "bak"); f = subsurface_fopen(filename, "w"); if (f) { flush_buffer(&buf, f); |