mirror of
https://git.tartarus.org/simon/putty.git
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73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
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/*
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* Wrapper around the Windows FormatMessage system for retrieving the
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* text of a system error code, with a simple API similar to strerror.
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*
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* Works by keeping a tree234 containing mappings from system error
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* codes to strings. Entries allocated in this tree are simply never
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* freed.
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*
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* Also, the returned string has its trailing newline removed (so it
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* can go in places like the Event Log that never want a newline), and
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* is prefixed with the error number (so that if a user sends an error
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* report containing a translated error message we can't read, we can
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* still find out what the error actually was).
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*/
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#include "putty.h"
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struct errstring {
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int error;
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char *text;
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};
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static int errstring_find(void *av, void *bv)
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{
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int *a = (int *)av;
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struct errstring *b = (struct errstring *)bv;
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if (*a < b->error)
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return -1;
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if (*a > b->error)
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return +1;
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return 0;
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}
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static int errstring_compare(void *av, void *bv)
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{
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struct errstring *a = (struct errstring *)av;
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return errstring_find(&a->error, bv);
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}
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static tree234 *errstrings = NULL;
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const char *win_strerror(int error)
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{
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struct errstring *es;
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if (!errstrings)
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errstrings = newtree234(errstring_compare);
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es = find234(errstrings, &error, errstring_find);
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if (!es) {
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char msgtext[65536]; /* maximum size for FormatMessage is 64K */
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es = snew(struct errstring);
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es->error = error;
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if (!FormatMessage((FORMAT_MESSAGE_FROM_SYSTEM |
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FORMAT_MESSAGE_IGNORE_INSERTS), NULL, error,
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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msgtext, lenof(msgtext)-1, NULL)) {
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sprintf(msgtext,
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"(unable to format: FormatMessage returned %u)",
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(unsigned int)GetLastError());
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} else {
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int len = strlen(msgtext);
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if (len > 0 && msgtext[len-1] == '\n')
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msgtext[len-1] = '\0';
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}
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es->text = dupprintf("Error %d: %s", error, msgtext);
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add234(errstrings, es);
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}
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return es->text;
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}
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