#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/gen/fmtcheck.c,v 1.7 2004/05/02 10:55:05 das Exp $");
#include <stdio.h>
#include <string.h>
#include <ctype.h>
__weak_reference(__fmtcheck, fmtcheck);
enum __e_fmtcheck_types {
FMTCHECK_START,
FMTCHECK_SHORT,
FMTCHECK_INT,
FMTCHECK_LONG,
FMTCHECK_QUAD,
FMTCHECK_PTRDIFFT,
FMTCHECK_SIZET,
FMTCHECK_SHORTPOINTER,
FMTCHECK_INTPOINTER,
FMTCHECK_LONGPOINTER,
FMTCHECK_QUADPOINTER,
FMTCHECK_PTRDIFFTPOINTER,
FMTCHECK_SIZETPOINTER,
#ifndef NO_FLOATING_POINT
FMTCHECK_DOUBLE,
FMTCHECK_LONGDOUBLE,
#endif
FMTCHECK_STRING,
FMTCHECK_WIDTH,
FMTCHECK_PRECISION,
FMTCHECK_DONE,
FMTCHECK_UNKNOWN
};
typedef enum __e_fmtcheck_types EFT;
#define RETURN(pf,f,r) do { \
*(pf) = (f); \
return r; \
} while (0)
static EFT
get_next_format_from_precision(const char **pf)
{
int sh, lg, quad, longdouble, ptrdifft, sizet;
const char *f;
sh = lg = quad = longdouble = ptrdifft = sizet = 0;
f = *pf;
switch (*f) {
case 'h':
f++;
sh = 1;
break;
case 'l':
f++;
if (!*f) RETURN(pf,f,FMTCHECK_UNKNOWN);
if (*f == 'l') {
f++;
quad = 1;
} else {
lg = 1;
}
break;
case 'q':
f++;
quad = 1;
break;
case 't':
f++;
ptrdifft = 1;
break;
case 'z':
f++;
sizet = 1;
break;
case 'L':
f++;
longdouble = 1;
break;
default:
break;
}
if (!*f) RETURN(pf,f,FMTCHECK_UNKNOWN);
if (strchr("diouxX", *f)) {
if (longdouble)
RETURN(pf,f,FMTCHECK_UNKNOWN);
if (lg)
RETURN(pf,f,FMTCHECK_LONG);
if (quad)
RETURN(pf,f,FMTCHECK_QUAD);
if (ptrdifft)
RETURN(pf,f,FMTCHECK_PTRDIFFT);
if (sizet)
RETURN(pf,f,FMTCHECK_SIZET);
RETURN(pf,f,FMTCHECK_INT);
}
if (*f == 'n') {
if (longdouble)
RETURN(pf,f,FMTCHECK_UNKNOWN);
if (sh)
RETURN(pf,f,FMTCHECK_SHORTPOINTER);
if (lg)
RETURN(pf,f,FMTCHECK_LONGPOINTER);
if (quad)
RETURN(pf,f,FMTCHECK_QUADPOINTER);
if (ptrdifft)
RETURN(pf,f,FMTCHECK_PTRDIFFTPOINTER);
if (sizet)
RETURN(pf,f,FMTCHECK_SIZETPOINTER);
RETURN(pf,f,FMTCHECK_INTPOINTER);
}
if (strchr("DOU", *f)) {
if (sh + lg + quad + longdouble + ptrdifft + sizet)
RETURN(pf,f,FMTCHECK_UNKNOWN);
RETURN(pf,f,FMTCHECK_LONG);
}
#ifndef NO_FLOATING_POINT
if (strchr("aAeEfFgG", *f)) {
if (longdouble)
RETURN(pf,f,FMTCHECK_LONGDOUBLE);
if (sh + lg + quad + ptrdifft + sizet)
RETURN(pf,f,FMTCHECK_UNKNOWN);
RETURN(pf,f,FMTCHECK_DOUBLE);
}
#endif
if (*f == 'c') {
if (sh + lg + quad + longdouble + ptrdifft + sizet)
RETURN(pf,f,FMTCHECK_UNKNOWN);
RETURN(pf,f,FMTCHECK_INT);
}
if (*f == 's') {
if (sh + lg + quad + longdouble + ptrdifft + sizet)
RETURN(pf,f,FMTCHECK_UNKNOWN);
RETURN(pf,f,FMTCHECK_STRING);
}
if (*f == 'p') {
if (sh + lg + quad + longdouble + ptrdifft + sizet)
RETURN(pf,f,FMTCHECK_UNKNOWN);
RETURN(pf,f,FMTCHECK_LONG);
}
RETURN(pf,f,FMTCHECK_UNKNOWN);
}
static EFT
get_next_format_from_width(const char **pf)
{
const char *f;
f = *pf;
if (*f == '.') {
f++;
if (*f == '*') {
RETURN(pf,f,FMTCHECK_PRECISION);
}
while (isdigit(*f)) f++;
if (!*f) RETURN(pf,f,FMTCHECK_UNKNOWN);
}
RETURN(pf,f,get_next_format_from_precision(pf));
}
static EFT
get_next_format(const char **pf, EFT eft)
{
int infmt;
const char *f;
if (eft == FMTCHECK_WIDTH) {
(*pf)++;
return get_next_format_from_width(pf);
} else if (eft == FMTCHECK_PRECISION) {
(*pf)++;
return get_next_format_from_precision(pf);
}
f = *pf;
infmt = 0;
while (!infmt) {
f = strchr(f, '%');
if (f == NULL)
RETURN(pf,f,FMTCHECK_DONE);
f++;
if (!*f)
RETURN(pf,f,FMTCHECK_UNKNOWN);
if (*f != '%')
infmt = 1;
else
f++;
}
while (*f && (strchr("#0- +", *f)))
f++;
if (*f == '*') {
RETURN(pf,f,FMTCHECK_WIDTH);
}
while (isdigit(*f)) f++;
if (!*f) {
RETURN(pf,f,FMTCHECK_UNKNOWN);
}
RETURN(pf,f,get_next_format_from_width(pf));
}
__const char *
__fmtcheck(const char *f1, const char *f2)
{
const char *f1p, *f2p;
EFT f1t, f2t;
if (!f1) return f2;
f1p = f1;
f1t = FMTCHECK_START;
f2p = f2;
f2t = FMTCHECK_START;
while ((f1t = get_next_format(&f1p, f1t)) != FMTCHECK_DONE) {
if (f1t == FMTCHECK_UNKNOWN)
return f2;
f2t = get_next_format(&f2p, f2t);
if (f1t != f2t)
return f2;
}
return f1;
}