445 lines
12 KiB
C
445 lines
12 KiB
C
#include "../stdio_p.h"
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#include "../../stdlib/stdlib_p.h"
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <stdbool.h>
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void __scanf_start(struct __scanf_input *in)
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{
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if(in->fp)
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in->buffer = fgetc(in->fp);
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else {
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in->buffer = (*in->str ? *in->str : EOF);
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in->str += (in->buffer != EOF);
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}
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}
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int __scanf_fetch(struct __scanf_input *in)
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{
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if(in->fp)
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return fgetc(in->fp);
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int c = *in->str;
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if(c == 0)
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return EOF;
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in->str++;
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return c;
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}
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void __scanf_end(struct __scanf_input *in)
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{
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if(in->buffer == EOF)
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return;
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if(in->fp)
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ungetc(in->buffer, in->fp);
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else
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in->str--;
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}
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void __purge_space( struct __scanf_input * __restrict__ in )
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{
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while (isspace(__scanf_peek(in))) __scanf_in(in);
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}
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void __scanf_store_i(int64_t value, int size, va_list *args)
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{
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if(size == 1)
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*va_arg(*args, int8_t *) = value;
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else if(size == 2)
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*va_arg(*args, int16_t *) = value;
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else if(size == 4)
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*va_arg(*args, int32_t *) = value;
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else if(size == 8)
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*va_arg(*args, int64_t *) = value;
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}
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void __scanf_store_d(long double value, int size, va_list *args)
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{
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if(size == sizeof(float))
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*va_arg(*args, float *) = value;
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else if(size == sizeof(double))
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*va_arg(*args, double *) = value;
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else if(size == sizeof(long double))
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*va_arg(*args, long double *) = value;
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}
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/* STATUS OF __scanf DEVELOPMENT */
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// XX = not done yet (but will be done)
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// OK = OK, done and tested
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// -- = not applicable
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// NO = not supported (and will not be done) only for %lc as long char are not supported by gint
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/*************************************************************************************************************/
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/* Specifier * Explanation * num * hh * h *none* l * ll * j * z * t * L */
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/*************************************************************************************************************/
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/* % * Parse literal '%' * -- * -- * -- * OK * -- * -- * -- * -- * -- * -- */
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/*************************************************************************************************************/
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/* c * match a char or several char * OK * -- * -- * OK * NO * -- * -- * -- * -- * -- */
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/*************************************************************************************************************/
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/* s * match a string * OK * -- * -- * OK * NO * -- * -- * -- * -- * -- */
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/*************************************************************************************************************/
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/* [set] * match a set of char * OK * -- * -- * OK * -- * -- * -- * -- * -- * -- */
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/*************************************************************************************************************/
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/* d * match a decimal integer * OK * OK * OK * OK * OK * OK * OK * OK * OK * -- */
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/*************************************************************************************************************/
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/* i * match an integer * OK * OK * OK * OK * OK * OK * OK * OK * OK * -- */
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/*************************************************************************************************************/
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/* d * match an unsigned decimal integer * OK * OK * OK * OK * OK * OK * OK * OK * OK * -- */
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/*************************************************************************************************************/
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/* o * match a unsigned octal integer * OK * OK * OK * OK * OK * OK * OK * OK * OK * -- */
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/*************************************************************************************************************/
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/* x,X * match a unsigned hexadecimal integer * OK * OK * OK * OK * OK * OK * OK * OK * OK * -- */
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/*************************************************************************************************************/
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/* n * return the nb of chars read so far * -- * -- * -- * OK * -- * -- * -- * -- * -- * -- */
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/*************************************************************************************************************/
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/* a,A * match a floating point number * OK * -- * -- * OK * OK * -- * -- * -- * -- * OK */
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/* e,E * match a floating point number * OK * -- * -- * OK * OK * -- * -- * -- * -- * OK */
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/* f,F * match a floating point number * OK * -- * -- * OK * OK * -- * -- * -- * -- * OK */
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/* g,G * match a floating point number * OK * -- * -- * OK * OK * -- * -- * -- * -- * OK */
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/*************************************************************************************************************/
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/* p * match a pointer * -- * -- * -- * OK * -- * -- * -- * -- * -- * -- */
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/*************************************************************************************************************/
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// %ms and %m[set] are not implemented (with memory allocation while parsing a chain or a set of characters)
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struct scanf_format {
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/* Maximum field width */
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int field_width;
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/* Size of the assigned (integer or floating-point) type, in bytes */
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uint8_t size;
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/* Whether to skip assignment */
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bool skip;
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/* Set of bytes allowed for bracket sets in %[] */
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uint8_t bracket_set[32];
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};
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/* Allow/disallow the entire set */
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static void bracket_set_init(uint8_t *set, bool allow)
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{
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memset(set, allow ? 0xff : 0x00, 32);
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}
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/* Allow/disallow a range of characters. Both ends are included. */
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static void bracket_set_range(
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uint8_t *set, uint8_t start, uint8_t end, bool allow)
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{
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for(int u = start; u <= end; u++) {
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int byte = u >> 3;
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int bit = 1 << (u & 7);
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if(allow)
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set[byte] |= bit;
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else
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set[byte] &= ~bit;
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}
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}
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/* Check whether a byte is allowed by the bracket set. */
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static bool bracket_set_test(uint8_t *set, int c)
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{
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return (c != EOF) && (set[c >> 3] & (1 << (c & 7)));
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}
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/* Parse a bracket set from a format string. Returns true on success. */
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static bool bracket_set_parse(uint8_t *set, char const *format, int *pos)
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{
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int last = 0;
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bool allow = true;
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bracket_set_init(set, false);
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/* '^' denotes a negated set */
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if(format[*pos] == '^') {
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allow = false;
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(*pos)++;
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bracket_set_init(set, true);
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}
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/* ']' as the first character adds ']' to the set */
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if(format[*pos] == ']' ) {
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bracket_set_range(set, ']', ']', allow);
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(*pos)++;
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}
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for(; format[*pos] && format[*pos] != ']'; (*pos)++) {
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/* '-' as the last character, thus explicitly in the set */
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if(format[*pos] == '-' && format[*pos + 1] == ']')
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bracket_set_range(set, '-', '-', allow);
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/* '-' as denoting a range */
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else if(format[*pos] == '-') {
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(*pos)++;
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bracket_set_range(set, last, format[*pos], allow);
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}
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/* Any other character */
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else {
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last = format[*pos];
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bracket_set_range(set, last, last, allow);
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}
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}
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return (format[*pos] == ']');
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}
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static int parse_fmt(char const *fmt, int *pos, struct scanf_format *opt)
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{
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opt->field_width = INT_MAX;
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opt->size = sizeof(int);
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opt->skip = false;
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int width = 0;
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char size_letter = 0;
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while(1) {
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(*pos)++;
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switch(fmt[*pos]) {
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case '*':
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opt->skip = true;
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break;
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case 'h':
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opt->size = (size_letter=='h') ? sizeof(char) : sizeof(short);
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size_letter = 'h';
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break;
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case 'l':
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opt->size = (size_letter=='l') ? sizeof(long long) : sizeof(long);
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size_letter = 'l';
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break;
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case 'L':
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opt->size = sizeof(long double);
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size_letter = 'L';
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break;
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case 'j':
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opt->size = sizeof(intmax_t);
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break;
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case 'z':
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opt->size = sizeof(size_t);
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break;
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case 't':
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opt->size = sizeof(ptrdiff_t);
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break;
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case '0' ... '9':
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width = width * 10 + (fmt[*pos] - '0');
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opt->field_width = width;
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break;
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case '[':
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(*pos)++;
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return bracket_set_parse(opt->bracket_set, fmt, pos) ? '[' : 0;
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case 'd':
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case 'i':
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case 'o':
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case 'u':
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case 'x':
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case 'X':
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case 'p':
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case 's':
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case 'n':
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return fmt[*pos];
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case 'a':
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case 'A':
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case 'e':
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case 'E':
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case 'f':
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case 'F':
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case 'g':
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case 'G':
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/* Adjust interpretation of no size / 'l' size */
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if(size_letter == 0)
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opt->size = sizeof(float);
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if(size_letter == 'l')
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opt->size = sizeof(double);
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return fmt[*pos];
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case 'c':
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if(opt->field_width == INT_MAX)
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opt->field_width = 1;
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return 'c';
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default:
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return 0;
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}
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}
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return 0;
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}
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int __scanf(
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struct __scanf_input * __restrict__ in,
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char const * __restrict__ format,
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va_list *args)
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{
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in->bytes_read = 0; // we haven't started to read char from the input stream
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int validrets = 0; // to be incremented each time we successfully read and store an input as per the format
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int err = 0; // err control on __strto_xx( ) functions
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int pos = 0; // current pos in the format string
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__scanf_start( in );
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// TODO: No __scanf_end() in any of the "return validrets"!!
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for(; format[pos]; pos++) {
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if(format[pos] == ' ') {
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__purge_space(in);
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continue;
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}
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else if(format[pos] != '%') {
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// if the next char of the stream is corresponding, we validate the read and go to the following char
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if(format[pos] == __scanf_peek( in )) {
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__scanf_in( in );
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pos++;
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continue;
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}
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else return validrets; // else we return the number of valid read
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}
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else if(format[pos + 1] == '%') {
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if(__scanf_peek(in) != '%') return validrets;
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else __scanf_in( in );
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pos++;
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continue;
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}
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/* Perform a conversion */
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else {
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struct scanf_format opt;
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int spec = parse_fmt(format, &pos, &opt);
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if(spec == 0)
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return validrets;
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switch(spec) {
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// we need to decrypt the corresponding scanf set of character
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case '[': {
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int currentlength = 0;
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// we need to assign the read char to the corresponding pointer
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char *c = opt.skip ? NULL : va_arg(*args, char *);
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for(int u=0; u<opt.field_width; u++) {
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int temp = __scanf_peek(in);
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if(bracket_set_test(opt.bracket_set, temp)) {
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__scanf_in(in);
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if(c) *c++ = temp;
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currentlength++;
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}
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else if(temp==EOF && !currentlength && !validrets)
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return EOF;
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else break;
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}
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if(!currentlength)
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return validrets;
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*c = '\0';
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validrets += !opt.skip;
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break;
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}
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// return the number of char read so far (cannot be skipped %*n is not valid)
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case 'n':
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*va_arg(*args, int *) = in->bytes_read;
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break;
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case 'd':
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case 'i':
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case 'o':
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case 'u':
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case 'x':
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case 'X': {
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int f = format[pos];
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int base = (f == 'd' || f == 'u') ? 10 :
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(f == 'o') ? 8:
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(f == 'x' || f == 'X') ? 16 : 0;
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bool use_unsigned = (f == 'o' || f == 'x' || f == 'X');
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long long int temp;
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err = __strto_int(in, base, NULL, &temp, use_unsigned,
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opt.field_width);
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if (err == EOF && validrets == 0) return EOF;
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if (err != 0) return validrets;
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if(!opt.skip)
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__scanf_store_i( temp, opt.size, args );
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validrets++;
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break;
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}
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case 'a':
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case 'A':
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case 'e':
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case 'E':
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case 'f':
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case 'F':
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case 'g':
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case 'G': {
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// read a double from the current input stream
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// and store in the corresponding arg as a char by reference
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long double temp;
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err = __strto_fp( in, NULL, NULL, &temp,
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opt.field_width);
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if (err == EOF && validrets == 0) return EOF;
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if (err != 0) return validrets;
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if(!opt.skip)
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__scanf_store_d( temp, opt.size, args );
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validrets++;
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break;
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}
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case 'p': {
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long int temp;
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if (!opt.skip) {
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void *p = (void *) va_arg( *args, void** ); // get the adress of the target pointer (void**)
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err = __strto_int( in, 0, p, NULL, true,
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opt.field_width);
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}
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else err = __strto_int( in, 0, &temp, NULL, true,
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opt.field_width);
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if (err == 0) validrets++;
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else return validrets;
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break;
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}
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case 'c': {
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char *c = opt.skip ? NULL : va_arg(*args, char *);
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for(int u = 0; u < opt.field_width; u++) {
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int temp = __scanf_in(in);
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if(temp==EOF) return EOF;
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else if(c) *c++ = temp;
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}
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validrets += !opt.skip;
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break;
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}
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case 's': {
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char temp;
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int curstrlength = 0;
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__purge_space(in);
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char *c = opt.skip ? NULL : va_arg(*args, char *);
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for(int u = 0; u < opt.field_width; u++) {
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temp = __scanf_peek(in);
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if(temp==EOF && curstrlength==0) return validrets;
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if(isspace(temp) || ((temp==EOF && curstrlength!=0))) {
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if(c) {
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*c = 0;
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validrets++;
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}
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break;
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}
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else {
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int temp = __scanf_in( in );
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if(c)
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*c++ = temp;
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curstrlength++;
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}
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}
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break;
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}
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}
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}
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}
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__scanf_end( in );
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return validrets;
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}
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