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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include "fgw_string.h"
#include <libfungwbind/c/fungw_c.h>
#include <libfungw/fungw_conv.h>
fgw_type_t FGW_MM; /* millimeter type ID; store distance in mm in the long field */
char *mm_dup_str(long val)
{
char *res = malloc(32);
if (val > 1000l*1000l) sprintf(res, "%f km", (double)val/(1000.0*1000.0));
else if (val > 1000) sprintf(res, "%f m", (double)val/1000.0);
else sprintf(res, "%ld mm", val);
return res;
}
char *mm_dup_str_nounit(long val)
{
char *res = malloc(32);
sprintf(res, "%ld", val);
return res;
}
long mmtol(const char *s, const char **end)
{
char *e;
long res = strtol(s, &e, 10);
if (*e != '\0') {
while(isspace(*e)) e++;
if (strcmp(e, "mm") == 0) { *end = e+2; }
else if (strcmp(e, "km") == 0) { *end = e+2; res *= 1000l*1000l; }
else if (strcmp(e, "m") == 0) { *end = e+1; res *= 1000; }
else if (strcmp(e, "dm") == 0) { *end = e+2; res *= 100; }
else if (strcmp(e, "cm") == 0) { *end = e+2; res *= 10; }
else *end = e;
}
else
*end = e;
return res;
}
#define conv_mmtol(dst, src) \
do { \
const char *end; \
dst = mmtol(src, &end); \
if (*end != '\0') \
return -1; \
} while(0)
int mm_arg_conv(fgw_ctx_t *ctx, fgw_arg_t *arg, fgw_type_t target)
{
if (target == FGW_MM) { /* convert to mm */
long tmp;
switch(FGW_BASE_TYPE(arg->type)) {
ARG_CONV_CASE_LONG(tmp, conv_assign)
ARG_CONV_CASE_LLONG(tmp, conv_assign)
ARG_CONV_CASE_DOUBLE(tmp, conv_assign)
ARG_CONV_CASE_LDOUBLE(tmp, conv_assign)
ARG_CONV_CASE_STR(tmp, conv_mmtol)
ARG_CONV_CASE_PTR(tmp, conv_err)
ARG_CONV_CASE_CLASS(tmp, conv_err)
ARG_CONV_CASE_INVALID(tmp, conv_err)
}
arg->type = FGW_MM;
arg->val.nat_long = tmp;
return 0;
}
if (arg->type == FGW_MM) { /* convert from mm */
long tmp = arg->val.nat_long;
switch(target) {
ARG_CONV_CASE_LONG(tmp, conv_rev_assign)
ARG_CONV_CASE_LLONG(tmp, conv_rev_assign)
ARG_CONV_CASE_DOUBLE(tmp, conv_rev_assign)
ARG_CONV_CASE_LDOUBLE(tmp, conv_rev_assign)
ARG_CONV_CASE_PTR(tmp, conv_err)
ARG_CONV_CASE_CLASS(tmp, conv_err)
ARG_CONV_CASE_INVALID(tmp, conv_err)
case FGW_AUTO:
/* Convert to "any base type" or rather "preferred base type"; chosoe
str because there we have explicit unit. */
/* intentional fall-thru */
case FGW_STR:
arg->val.str = mm_dup_str(tmp);
arg->type = FGW_STR | FGW_DYN;
return 0;
}
arg->type = target;
return 0;
}
fprintf(stderr, "Neither side of the conversion is mm\n");
abort();
}
/* Lazy approach: convert only to/from string */
int mm_arg_conv_lazy(fgw_ctx_t *ctx, fgw_arg_t *arg, fgw_type_t target)
{
if (target == FGW_MM) { /* convert to string and then to mm */
long tmp;
const char *end;
if (fgw_arg_conv(ctx, arg, FGW_STR) != 0)
return -1;
tmp = mmtol(arg->val.str, &end);
if (arg->type & FGW_DYN)
free(arg->val.str);
if (*end != '\0')
return -1;
arg->type = FGW_MM;
arg->val.nat_long = tmp;
return 0;
}
if (arg->type == FGW_MM) { /* convert from mm */
long tmp = arg->val.nat_long;
arg->val.str = mm_dup_str_nounit(tmp);
arg->type = FGW_STR | FGW_DYN;
return 0;
}
fprintf(stderr, "Neither side of the conversion is mm\n");
abort();
}
void test(fgw_ctx_t *ctx)
{
fgw_arg_t a, b;
int res;
a.val.str = "124cm";
a.type = FGW_STR;
res = fgw_arg_conv(ctx, &a, FGW_MM);
printf("str to mm: %d: 0x%x %ld\n", res, a.type, a.val.nat_long);
b = a;
res = fgw_arg_conv(ctx, &a, FGW_STR);
printf("mm to str: %d: 0x%x %s\n", res, a.type, a.val.str);
res = fgw_arg_conv(ctx, &b, FGW_DOUBLE);
printf("mm to double: %d: 0x%x %f\n", res, b.type, b.val.nat_double);
}
int main()
{
fgw_ctx_t ctx;
string_init();
fgw_init(&ctx, "host");
printf("--- proper:\n");
FGW_MM = fgw_reg_custom_type(&ctx, 0, "mm", mm_arg_conv, NULL);
assert(FGW_MM != FGW_INVALID);
test(&ctx);
printf("--- lazy:\n");
FGW_MM = fgw_reg_custom_type(&ctx, 0, "mm", mm_arg_conv_lazy, NULL);
assert(FGW_MM != FGW_INVALID);
test(&ctx);
fgw_uninit(&ctx);
fgw_atexit();
return 0;
}
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