nhyatt/putty-source
1
0
Fork 0
mirror of https://git.tartarus.org/simon/putty.git synced 2025-04-09 23:28:06 -05:00
Code Issues Projects Releases Wiki Activity

Invent a win_strerror() function which behaves as much like Unix

Browse Source 
strerror as I can arrange, wrapping up all the ugly FormatMessage
nonsense and caching previously looked-up messages for reuse so that
callers can treat them as static.

[originally from svn r9956]
This commit is contained in:
Simon Tatham 2013-07-22 07:11:39 +00:00
parent 13667de106
commit 54693d4079
2 changed files with 64 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
windows/winmisc.c
View File

@ -173,6 +173,69 @@ HMODULE load_system32_dll(const char *libname)
return ret;
}
/*
* A tree234 containing mappings from system error codes to strings.
*/
struct errstring {
int error;
char *text;
};
static int errstring_find(void *av, void *bv)
{
int *a = (int *)av;
struct errstring *b = (struct errstring *)bv;
if (*a < b->error)
return -1;
if (*a > b->error)
return +1;
return 0;
}
static int errstring_compare(void *av, void *bv)
{
struct errstring *a = (struct errstring *)av;
return errstring_find(&a->error, bv);
}
static tree234 *errstrings = NULL;
const char *win_strerror(int error)
{
struct errstring *es;
if (!errstrings)
errstrings = newtree234(errstring_compare);
es = find234(errstrings, &error, errstring_find);
if (!es) {
int bufsize, bufused;
es = snew(struct errstring);
es->error = error;
/* maximum size for FormatMessage is 64K */
bufsize = 65535;
es->text = snewn(bufsize, char);
if (!FormatMessage((FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS), NULL, error,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
es->text + bufused, bufsize - bufused, NULL)) {
sprintf(es->text,
"Windows error code %d (and FormatMessage returned %d)",
error, GetLastError());
} else {
int len = strlen(es->text);
if (len > 0 && es->text[len-1] == '\n')
es->text[len-1] = '\0';
}
es->text = sresize(es->text, strlen(es->text) + 1, char);
add234(errstrings, es);
}
return es->text;
}
#ifdef DEBUG
static FILE *debug_fp = NULL;
static HANDLE debug_hdl = INVALID_HANDLE_VALUE;

1
windows/winstuff.h
View File

@ -461,6 +461,7 @@ void show_help(HWND hwnd);
extern OSVERSIONINFO osVersion;
BOOL init_winver(void);
HMODULE load_system32_dll(const char *libname);
const char *win_strerror(int error);
/*
* Exports from sizetip.c.