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/*
* Behaves as gmp_printf with new conversion specifier %B for element_t types
*/
#include <stdio.h>
#include <stdint.h> // for intptr_t
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <gmp.h>
#include "pbc_utils.h"
#include "pbc_field.h"
#include "pbc_memory.h"
struct sninfo_s {
char *s;
size_t size;
size_t left;
size_t result;
};
// TODO: remove repeated code for error handling
static int do_print(int (*strcb)(void *, char *s),
int (*fstrcb)(void *, char *s, void *),
int (*elcb)(void *, element_ptr e),
void *data,
const char *format, va_list ap) {
// A primitive front-end for printf()-family functions. Only handles types
// in specifiers, and assumes they all take void * arguments.
//
// I wish register_printf_specifier() were more widespread.
int count = 0, status;
char *copy, *c, *start, *next;
element_ptr e;
int found;
copy = pbc_strdup(format);
start = next = copy;
for(;;) {
for(;;) {
c = strchr(next, '%');
if (!c) {
status = strcb(data, start);
if (status < 0) {
count = -1;
} else count += status;
goto done;
}
if (!*(c + 1)) goto done;
if (*(c + 1) != '%') break;
next = c + 2;
}
*c = 0;
status = strcb(data, start);
if (status < 0) {
count = -1;
goto done;
} else count += status;
*c = '%';
start = c;
found = 0;
while(!found) {
c++;
switch (*c) {
case '\0':
goto done;
case 'B':
e = va_arg(ap, element_ptr);
status = elcb(data, e);
if (status < 0) {
count = -1;
goto done;
} else count += status;
found = 1;
break;
default:
if (strchr("diouxXeEfFgGaAcspnmZ", *c)) {
if (*c == 'Z') c++;
char ch = *(c+1);
*(c+1) = '\0';
status = fstrcb(data, start, va_arg(ap, void *));
if (status < 0) {
count = -1;
goto done;
} else count += status;
*(c+1) = ch;
found = 1;
}
break;
}
}
next = start = c + 1;
}
done:
pbc_free(copy);
return count;
}
static int string_cb(void *file, char *s) {
if (fputs(s, file) == EOF) return -1;
return strlen(s);
}
static int format_cb(void *file, char *fstring, void *ptr) {
return gmp_fprintf(file, fstring, ptr);
}
static int element_cb(void *file, element_ptr e) {
return element_out_str(file, 0, e);
}
int element_vfprintf(FILE *stream, const char *format, va_list ap) {
return do_print(string_cb, format_cb, element_cb, stream, format, ap);
}
int element_fprintf(FILE *stream, const char *format, ...) {
int status;
va_list ap;
va_start(ap, format);
status = element_vfprintf(stream, format, ap);
va_end(ap);
return status;
}
int element_printf(const char *format, ...) {
int status;
va_list ap;
va_start(ap, format);
status = element_vfprintf(stdout, format, ap);
va_end(ap);
return status;
}
static void next(struct sninfo_s *p, int status) {
p->result += status;
p->left = p->result >= p->size ? 0 : p->size - p->result;
}
static int string_cbv(void *data, char *s) {
struct sninfo_s *p = data;
int status = snprintf(p->s + p->result, p->left, "%s", s);
if (status < 0) return status;
next(data, status);
return status;
}
static int format_cbv(void *data, char *fstring, void *ptr) {
struct sninfo_s *p = data;
int status = gmp_snprintf(p->s + p->result, p->left, fstring, ptr);
if (status < 0) return status;
next(data, status);
return status;
}
static int element_cbv(void *data, element_ptr e) {
struct sninfo_s *p = data;
int status = element_snprint(p->s + p->result, p->left, e);
if (status < 0) return status;
next(data, status);
return status;
}
int element_vsnprintf(char *buf, size_t size, const char *fmt, va_list ap) {
struct sninfo_s info;
info.s = buf;
info.left = info.size = size;
info.result = 0;
do_print(string_cbv, format_cbv, element_cbv, &info, fmt, ap);
return info.result;
}
int element_snprintf(char *buf, size_t size, const char *fmt, ...) {
int status;
va_list ap;
va_start(ap, fmt);
status = element_vsnprintf(buf, size, fmt, ap);
va_end(ap);
return status;
}
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