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/*
* Copyright (C) 2020-2021 Tomasz Kramkowski <tk@the-tk.com>
* SPDX-License-Identifier: MIT
*/
#include <assert.h>
#include <ctype.h>
#include <inttypes.h>
#include <limits.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
struct {
enum endian { BIG, LITTLE } e;
char *prefix;
} endian[] = {
{ BIG, "" },
{ BIG, ">" },
{ LITTLE, "<" },
};
struct fmtinfo {
char fmt;
char *type;
intmax_t min;
uintmax_t max;
size_t size;
} fmtinfo[] = {
{ 'b', "signed char", INTMAX_C( -128), UINTMAX_C( 127), 1 },
{ 'B', "unsigned char", INTMAX_C( 0), UINTMAX_C( 255), 1 },
{ 'h', "signed short", INTMAX_C( -32768), UINTMAX_C( 32767), 2 },
{ 'H', "unsigned short", INTMAX_C( 0), UINTMAX_C( 65535), 2 },
{ 'i', "signed int", INTMAX_C( -32768), UINTMAX_C( 32767), 2 },
{ 'I', "unsigned int", INTMAX_C( 0), UINTMAX_C( 65535), 2 },
{ 'l', "signed long", INTMAX_C( -2147483648), UINTMAX_C( 2147483647), 4 },
{ 'L', "unsigned long", INTMAX_C( 0), UINTMAX_C( 4294967295), 4 },
{ 'q', "signed long long", -INTMAX_C(9223372036854775807) - 1, UINTMAX_C( 9223372036854775807), 8 },
{ 'Q', "unsigned long long", INTMAX_C( 0), UINTMAX_C(18446744073709551615), 8 },
};
static char cchar(char c)
{
if (c == '\0') return c;
if (isalnum(c)) return c;
return '_';
}
static const char *cname(const char *s)
{
static char ret[100];
for (int i = 0; i < 99; i++) {
ret[i] = cchar(s[i]);
if (s[i] == '\0') break;
}
return ret;
}
static const char *u2bytes(enum endian e, int n, uintmax_t v)
{
static char b[100];
char *p = b;
assert(n > 0 && n <= 8);
for (int i = 0; i < n; i++) {
p += snprintf(p, b + sizeof(b) - p, "%s0x%x", i == 0 ? "" : ", ",
(int)((v >> (e == LITTLE ? i : n - i - 1) * 8) & 0xff));
assert(p < b + sizeof(b));
}
return b;
}
static uintmax_t i2u(int n, intmax_t v)
{
if (v >= 0)
return v;
return (UINTMAX_MAX >> (sizeof (uintmax_t) * CHAR_BIT - n * 8)) + v + 1;
}
static const char *i2bytes(enum endian e, int n, intmax_t v)
{
return u2bytes(e, n, i2u(n, v));
}
static void unpack_signed(FILE *out, const struct fmtinfo *fi, enum endian e, intmax_t testval, int arraysize)
{
char sizeprefix[11] = "";
const char *data;
if (arraysize >= 1)
snprintf(sizeprefix, sizeof sizeprefix, "%d", arraysize);
else
arraysize = 1;
fprintf(out, "\tCHECK_UNPACK(DATA(");
data = i2bytes(endian[e].e, fi->size, testval);
for (int i = 0; i < arraysize; i++)
fprintf(out, "%s%s", i == 0 ? "" : ", ", data);
fprintf(out, "), \"%s%s%c\", v);\n", endian[e].prefix, sizeprefix, fi->fmt);
for (int i = 0; i < arraysize; i++)
fprintf(out, "\tCHECK_EQUAL(PRIdMAX, (intmax_t)v[%d], -INTMAX_C(%" PRIdMAX ")-1);\n", i, -(testval + 1));
}
static void unpack_unsigned(FILE *out, const struct fmtinfo *fi, enum endian e, uintmax_t testval, int arraysize)
{
char sizeprefix[11] = "";
const char *data;
if (arraysize >= 1)
snprintf(sizeprefix, sizeof sizeprefix, "%d", arraysize);
else
arraysize = 1;
fprintf(out, "\tCHECK_UNPACK(DATA(");
data = u2bytes(endian[e].e, fi->size, testval);
for (int i = 0; i < arraysize; i++)
fprintf(out, "%s%s", i == 0 ? "" : ", ", data);
fprintf(out, "), \"%s%s%c\", v);\n", endian[e].prefix, sizeprefix, fi->fmt);
for (int i = 0; i < arraysize; i++)
fprintf(out, "\tCHECK_EQUAL(PRIdMAX, (uintmax_t)v[%d], UINTMAX_C(%" PRIuMAX "));\n", i, testval);
}
static void unpack_gen(FILE *out, const struct fmtinfo *fi, int arraysize)
{
int realsize = arraysize == 0 ? 1 : arraysize;
bool sign;
sign = islower(fi->fmt);
fprintf(out, "TEST(unpack_simple%d_%s, \"unpack simple", arraysize, cname(fi->type));
if (arraysize != 0)
fprintf(out, " array[%d]", arraysize);
fprintf(out, " %s\")\n", fi->type);
fprintf(out, "{\n");
fprintf(out, "\t%s v[%d] = { ", fi->type, realsize );
for (int i = 0; i < realsize; i++)
fprintf(out, "%s__LINE__ + %d", i == 0 ? "" : ", ", i);
fprintf(out, " };\n");
for (size_t e = 0; e < sizeof endian / sizeof endian[0]; e++) {
for (int i = sign ? -1 : 0; i <= 1; i++)
unpack_signed(out, fi, e, i, arraysize);
if (sign)
unpack_signed(out, fi, e, fi->min, arraysize);
unpack_unsigned(out, fi, e, fi->max, arraysize);
}
fprintf(out, "\treturn true;\n");
fprintf(out, "}\n");
}
int main(void)
{
FILE *out = stdout;
for (size_t i = 0; i < sizeof fmtinfo / sizeof fmtinfo[0]; i++) {
unpack_gen(out, &fmtinfo[i], 0);
for (int j = 2; j < 4; j++)
unpack_gen(out, &fmtinfo[i], j);
}
}
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