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PyErr_Format(): Factor out most of this code into 

PyString_FromFormat() since it's much more generally useful than
    just for exceptions.
This commit is contained in:
Barry Warsaw 2001-08-24 18:35:23 +00:00
parent 7ce3694a52
commit 876c8cb597
1 changed files with 1 additions and 114 deletions
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115
Python/errors.c
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@ -385,128 +385,15 @@ PyObject *
PyErr_Format(PyObject *exception, const char *format, ...)
{
va_list vargs;
int n, i;
const char* f;
char* s;
PyObject* string;
/* step 1: figure out how large a buffer we need */
#ifdef HAVE_STDARG_PROTOTYPES
va_start(vargs, format);
#else
va_start(vargs);
#endif
n = 0;
for (f = format; *f; f++) {
if (*f == '%') {
const char* p = f;
while (*++f && *f != '%' && !isalpha(Py_CHARMASK(*f)))
;
switch (*f) {
case 'c':
(void) va_arg(vargs, int);
/* fall through... */
case '%':
n++;
break;
case 'd': case 'i': case 'x':
(void) va_arg(vargs, int);
/* 20 bytes should be enough to hold a 64-bit
integer */
n = n + 20;
break;
case 's':
s = va_arg(vargs, char*);
n = n + strlen(s);
break;
default:
/* if we stumble upon an unknown
formatting code, copy the rest of
the format string to the output
string. (we cannot just skip the
code, since there's no way to know
what's in the argument list) */
n = n + strlen(p);
goto expand;
}
} else
n = n + 1;
}
expand:
string = PyString_FromStringAndSize(NULL, n);
if (!string)
return NULL;
#ifdef HAVE_STDARG_PROTOTYPES
va_start(vargs, format);
#else
va_start(vargs);
#endif
/* step 2: fill the buffer */
s = PyString_AsString(string);
for (f = format; *f; f++) {
if (*f == '%') {
const char* p = f++;
/* parse the width.precision part (we're only
interested in the precision value, if any) */
n = 0;
while (isdigit(Py_CHARMASK(*f)))
n = (n*10) + *f++ - '0';
if (*f == '.') {
f++;
n = 0;
while (isdigit(Py_CHARMASK(*f)))
n = (n*10) + *f++ - '0';
}
while (*f && *f != '%' && !isalpha(Py_CHARMASK(*f)))
f++;
switch (*f) {
case 'c':
*s++ = va_arg(vargs, int);
break;
case 'd':
sprintf(s, "%d", va_arg(vargs, int));
s = s + strlen(s);
break;
case 'i':
sprintf(s, "%i", va_arg(vargs, int));
s = s + strlen(s);
break;
case 'x':
sprintf(s, "%x", va_arg(vargs, int));
s = s + strlen(s);
break;
case 's':
p = va_arg(vargs, char*);
i = strlen(p);
if (n > 0 && i > n)
i = n;
memcpy(s, p, i);
s = s + i;
break;
case '%':
*s++ = '%';
break;
default:
strcpy(s, p);
s = s + strlen(s);
goto end;
}
} else
*s++ = *f;
}
end:
_PyString_Resize(&string, s - PyString_AsString(string));
string = PyString_FromFormatV(format, vargs);
PyErr_SetObject(exception, string);
Py_XDECREF(string);