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[/] [hf-risc/] [trunk/] [software/] [lib/] [libc.c] - Blame information for rev 20

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/* file:          libc.c
 * description:   small C library
 * date:          09/2015
 * author:        Sergio Johann Filho <sergio.filho@pucrs.br>
 */
 
#include <hf-risc.h>
 
/*
auxiliary routines
*/
 
void uart_init(uint32_t baud){
        uint16_t d;
 
        d = (uint16_t)(CPU_SPEED / baud);
        UART_DIVISOR = d;
        d = UART;
}
 
void delay_ms(uint32_t msec){
        volatile uint32_t cur, last, delta, msecs;
        uint32_t cycles_per_msec;
 
        last = COUNTER;
        delta = msecs = 0;
        cycles_per_msec = CPU_SPEED / 1000;
        while(msec > msecs){
                cur = COUNTER;
                if (cur < last)
                        delta += (cur + (CPU_SPEED - last));
                else
                        delta += (cur - last);
                last = cur;
                if (delta >= cycles_per_msec){
                        msecs += delta / cycles_per_msec;
                        delta %= cycles_per_msec;
                }
        }
}
 
void delay_us(uint32_t usec){
        volatile uint32_t cur, last, delta, usecs;
        uint32_t cycles_per_usec;
 
        last = COUNTER;
        delta = usecs = 0;
        cycles_per_usec = CPU_SPEED / 1000000;
        while(usec > usecs){
                cur = COUNTER;
                if (cur < last)
                        delta += (cur + (CPU_SPEED - last));
                else
                        delta += (cur - last);
                last = cur;
                if (delta >= cycles_per_usec){
                        usecs += delta / cycles_per_usec;
                        delta %= cycles_per_usec;
                }
        }
}
 
/*
interrupt management
*/
 
static funcptr isr[32];
 
void interrupt_handler(uint32_t cause, uint32_t *stack){                // called from the ISR
        int32_t i = 0;
 
        do {
                if(cause & 0x1){
                        if(isr[i]){
                                isr[i](stack);
                        }
                }
                cause >>= 1;
                ++i;
        } while(cause);
}
 
void interrupt_register(uint32_t mask, funcptr ptr){
        int32_t i;
 
        for(i=0;i<32;++i)
                if(mask & (1<<i))
                        isr[i] = ptr;
}
 
void exception_handler(uint32_t epc, uint32_t opcode)
{
}
 
/*
minimal custom C library
*/
 
#ifndef DEBUG_PORT
void putchar(int32_t value){            // polled putchar()
        while((IRQ_CAUSE & IRQ_UART_WRITE_AVAILABLE) == 0);
        UART = value;
}
 
int32_t kbhit(void){
        return IRQ_CAUSE & IRQ_UART_READ_AVAILABLE;
}
 
int32_t getchar(void){                  // polled getch()
        while(!kbhit()) ;
        return UART;
}
#else
void putchar(int32_t value){            // polled putchar()
        DEBUG_ADDR = value;
}
 
int32_t kbhit(void){
        return 0;
}
 
int32_t getchar(void){                  // polled getch()
        return DEBUG_ADDR;
}
#endif
 
int8_t *strcpy(int8_t *dst, const int8_t *src){
        int8_t *dstSave=dst;
        int32_t c;
 
        do{
                c = *dst++ = *src++;
        } while(c);
        return dstSave;
}
 
int8_t *strncpy(int8_t *s1, int8_t *s2, int32_t n){
        int32_t i;
        int8_t *os1;
 
        os1 = s1;
        for (i = 0; i < n; i++)
                if ((*s1++ = *s2++) == '\0') {
                        while (++i < n)
                                *s1++ = '\0';
                        return(os1);
                }
        return(os1);
}
 
int8_t *strcat(int8_t *dst, const int8_t *src){
        int32_t c;
        int8_t *dstSave=dst;
 
        while(*dst)
                ++dst;
        do{
                c = *dst++ = *src++;
        } while(c);
 
        return dstSave;
}
 
int8_t *strncat(int8_t *s1, int8_t *s2, int32_t n){
        int8_t *os1;
 
        os1 = s1;
        while (*s1++);
        --s1;
        while ((*s1++ = *s2++))
                if (--n < 0) {
                        *--s1 = '\0';
                        break;
                }
        return(os1);
}
 
int32_t strcmp(const int8_t *s1, const int8_t *s2){
        while (*s1 == *s2++)
                if (*s1++ == '\0')
                        return(0);
 
        return(*s1 - *--s2);
}
 
int32_t strncmp(int8_t *s1, int8_t *s2, int32_t n){
        while (--n >= 0 && *s1 == *s2++)
                if (*s1++ == '\0')
                        return(0);
 
        return(n<0 ? 0 : *s1 - *--s2);
}
 
int8_t *strstr(const int8_t *string, const int8_t *find){
        int32_t i;
 
        for(;;){
                for(i = 0; string[i] == find[i] && find[i]; ++i);
                if(find[i] == 0)
                        return (char *)string;
                if(*string++ == 0)
                        return NULL;
        }
}
 
int32_t strlen(const int8_t *s){
        int32_t n;
 
        n = 0;
        while (*s++)
                n++;
 
        return(n);
}
 
int8_t *strchr(const int8_t *s, int32_t c){
        while (*s != (int8_t)c)
                if (!*s++)
                        return 0;
 
        return (int8_t *)s;
}
 
int8_t *strpbrk(int8_t *str, int8_t *set){
        int8_t c, *p;
 
        for (c = *str; c != 0; str++, c = *str) {
                for (p = set; *p != 0; p++) {
                        if (c == *p) {
                                return str;
                        }
                }
        }
        return 0;
 
}
 
int8_t *strsep(int8_t **pp, int8_t *delim){
        int8_t *p, *q;
 
        if (!(p = *pp))
                return 0;
        if ((q = strpbrk (p, delim))){
                *pp = q + 1;
                *q = '\0';
        }else   *pp = 0;
 
        return p;
}
 
int8_t *strtok(int8_t *s, const int8_t *delim){
        const int8_t *spanp;
        int32_t c, sc;
        int8_t *tok;
        static int8_t *last;
 
        if (s == NULL && (s = last) == NULL)
                return (NULL);
 
        cont:
        c = *s++;
        for (spanp = delim; (sc = *spanp++) != 0;){
                if (c == sc)
                goto cont;
        }
 
        if (c == 0){
                last = NULL;
                return (NULL);
        }
        tok = s - 1;
 
        for(;;){
                c = *s++;
                spanp = delim;
                do{
                        if ((sc = *spanp++) == c){
                                if (c == 0)
                                        s = NULL;
                                else
                                        s[-1] = 0;
                                last = s;
                                return (tok);
                        }
                }while (sc != 0);
        }
}
 
void *memcpy(void *dst, const void *src, uint32_t n){
        int8_t *r1 = dst;
        const int8_t *r2 = src;
 
        while (n--)
                *r1++ = *r2++;
 
        return dst;
}
 
void *memmove(void *dst, const void *src, uint32_t n){
        int8_t *s = (int8_t *)dst;
        const int8_t *p = (const int8_t *)src;
 
        if (p >= s){
                while (n--)
                        *s++ = *p++;
        }else{
                s += n;
                p += n;
                while (n--)
                        *--s = *--p;
        }
 
        return dst;
}
 
int32_t memcmp(const void *cs, const void *ct, uint32_t n){
        const uint8_t *r1 = (const uint8_t *)cs;
        const uint8_t *r2 = (const uint8_t *)ct;
 
        while (n && (*r1 == *r2)) {
                ++r1;
                ++r2;
                --n;
        }
 
        return (n == 0) ? 0 : ((*r1 < *r2) ? -1 : 1);
}
 
void *memset(void *s, int32_t c, uint32_t n){
        uint8_t *p = (uint8_t *)s;
 
        while (n--)
                *p++ = (uint8_t)c;
 
        return s;
}
 
int32_t strtol(const int8_t *s, int8_t **end, int32_t base){
        int32_t i;
        uint32_t ch, value=0, neg=0;
 
        if(s[0] == '-'){
                neg = 1;
                ++s;
        }
        if(s[0] == '0' && s[1] == 'x'){
                base = 16;
                s += 2;
        }
        for(i = 0; i <= 8; ++i){
                ch = *s++;
                if('0' <= ch && ch <= '9')
                        ch -= '0';
                else if('A' <= ch && ch <= 'Z')
                        ch = ch - 'A' + 10;
                else if('a' <= ch && ch <= 'z')
                        ch = ch - 'a' + 10;
                else
                        break;
                value = value * base + ch;
        }
        if(end)
                *end = (char*)s - 1;
        if(neg)
                value = -(int32_t)value;
        return value;
}
 
int32_t atoi(const int8_t *s){
        int32_t n, f;
 
        n = 0;
        f = 0;
        for(;;s++){
                switch(*s){
                case ' ':
                case '\t':
                        continue;
                case '-':
                        f++;
                case '+':
                        s++;
                }
                break;
        }
        while(*s >= '0' && *s <= '9')
                n = n*10 + *s++ - '0';
        return(f?-n:n);
}
 
int8_t *itoa(int32_t i, int8_t *s, int32_t base){
        int8_t *ptr = s, *ptr1 = s, tmp_char;
        int32_t tmp_value;
 
        if (base < 2 || base > 36) {
                *s = '\0';
                return s;
        }
        do {
                tmp_value = i;
                i /= base;
                *ptr++ = "zyxwvutsrqponmlkjihgfedcba9876543210123456789abcdefghijklmnopqrstuvwxyz" [35 + (tmp_value - i * base)];
        } while (i);
        if (tmp_value < 0)
                *ptr++ = '-';
        *ptr-- = '\0';
        while(ptr1 < ptr) {
                tmp_char = *ptr;
                *ptr--= *ptr1;
                *ptr1++ = tmp_char;
        }
        return s;
}
 
int32_t puts(const int8_t *str){
        while(*str)
                putchar(*str++);
        putchar('\n');
 
        return 0;
}
 
int8_t *gets(int8_t *s){
        int32_t c;
        int8_t *cs;
 
        cs = s;
        while ((c = getchar()) != '\n' && c >= 0)
                *cs++ = c;
        if (c<0 && cs==s)
                return(NULL);
        *cs++ = '\0';
        return(s);
}
 
int32_t abs(int32_t n){
        return n>=0 ? n:-n;
}
 
static uint32_t rand1=0xbaadf00d;
 
int32_t random(void){
        rand1 = rand1 * 1103515245 + 12345;
        return (uint32_t)(rand1 >> 16) & 32767;
}
 
void srand(uint32_t seed){
        rand1 = seed;
}
 
/*
printf() and sprintf()
*/
#include <stdarg.h>
#define PAD_RIGHT 1
#define PAD_ZERO 2
#define PRINT_BUF_LEN 30
 
static void printchar(int8_t **str, int32_t c){
        if (str){
                **str = c;
                ++(*str);
        } else
                (void)putchar(c);
}
 
static int32_t prints(int8_t **out, const int8_t *string, int32_t width, int32_t pad){
        int32_t pc = 0, padchar = ' ';
 
        if (width > 0){
                int32_t len = 0;
                const int8_t *ptr;
                for (ptr = string; *ptr; ++ptr) ++len;
                if (len >= width) width = 0;
                else width -= len;
                if (pad & PAD_ZERO) padchar = '0';
        }
        if (!(pad & PAD_RIGHT)){
                for ( ; width > 0; --width){
                        printchar (out, padchar);
                        ++pc;
                }
        }
        for ( ; *string ; ++string){
                printchar (out, *string);
                ++pc;
        }
        for ( ; width > 0; --width){
                printchar (out, padchar);
                ++pc;
        }
 
        return pc;
}
 
static int32_t printi(int8_t **out, int32_t i, int32_t b, int32_t sg, int32_t width, int32_t pad, int32_t letbase){
        int8_t print_buf[PRINT_BUF_LEN];
        int8_t *s;
        int32_t t, neg = 0, pc = 0;
        uint32_t u = i;
 
        if (i == 0){
                print_buf[0] = '0';
                print_buf[1] = '\0';
                return prints (out, print_buf, width, pad);
        }
 
        if (sg && b == 10 && i < 0){
                neg = 1;
                u = -i;
        }
 
        s = print_buf + PRINT_BUF_LEN-1;
        *s = '\0';
 
        while (u){
                t = u % b;
                if( t >= 10 )
                        t += letbase - '0' - 10;
                *--s = t + '0';
                u /= b;
        }
 
        if (neg){
                if(width && (pad & PAD_ZERO)){
                        printchar (out, '-');
                        ++pc;
                        --width;
                }
                else {
                        *--s = '-';
                }
        }
 
        return pc + prints (out, s, width, pad);
}
 
static int32_t print(int8_t **out, const int8_t *format, va_list args){
        int32_t width, pad;
        int32_t pc = 0;
        int8_t scr[2];
 
        for (; *format != 0; ++format){
                if (*format == '%'){
                        ++format;
                        width = pad = 0;
                        if (*format == '\0') break;
                        if (*format == '%') goto out;
                        if (*format == '-'){
                                ++format;
                                pad = PAD_RIGHT;
                        }
                        while (*format == '0'){
                                ++format;
                                pad |= PAD_ZERO;
                        }
                        for (; *format >= '0' && *format <= '9'; ++format){
                                width *= 10;
                                width += *format - '0';
                        }
                        if(*format == 's'){
                                int8_t *s = (int8_t *)va_arg(args, int32_t);
                                pc += prints(out, s?s:"(null)", width, pad);
                                continue;
                        }
                        if(*format == 'd'){
                                pc += printi(out, va_arg(args, int32_t), 10, 1, width, pad, 'a');
                                continue;
                        }
                        if(*format == 'x'){
                                pc += printi(out, va_arg(args, int32_t), 16, 0, width, pad, 'a');
                                continue;
                        }
                        if(*format == 'X'){
                                pc += printi(out, va_arg(args, int32_t), 16, 0, width, pad, 'A');
                                continue;
                        }
                        if(*format == 'u'){
                                pc += printi(out, va_arg(args, int32_t), 10, 0, width, pad, 'a');
                                continue;
                        }
                        if(*format == 'c'){
                                /* char are converted to int then pushed on the stack */
                                scr[0] = (int8_t)va_arg(args, int32_t);
                                scr[1] = '\0';
                                pc += prints(out, scr, width, pad);
                                continue;
                        }
                }
                else {
                out:
                        printchar(out, *format);
                        ++pc;
                }
        }
        if (out) **out = '\0';
        va_end( args );
        return pc;
}
 
int printf(const int8_t *fmt, ...){
        va_list args;
 
        va_start(args, fmt);
        return print(0, fmt, args);
}
 
int sprintf(int8_t *out, const int8_t *fmt, ...){
        va_list args;
 
        va_start(args, fmt);
        return print(&out, fmt, args);
}
 
/*
software implementation of multiply/divide and 64-bit routines
*/
 
typedef union{
        int64_t all;
        struct{
#if LITTLE_ENDIAN
                uint32_t low;
                int32_t high;
#else
                int32_t high;
                uint32_t low;
#endif
        } s;
} dwords;
 
int32_t __mulsi3(uint32_t a, uint32_t b){
        uint32_t answer = 0;
 
        while(b){
                if(b & 1)
                        answer += a;
                a <<= 1;
                b >>= 1;
        }
        return answer;
}
 
int64_t __muldsi3(uint32_t a, uint32_t b){
        dwords r;
 
        const int32_t bits_in_word_2 = (int32_t)(sizeof(int32_t) * 8) / 2;
        const uint32_t lower_mask = (uint32_t)~0 >> bits_in_word_2;
        r.s.low = (a & lower_mask) * (b & lower_mask);
        uint32_t t = r.s.low >> bits_in_word_2;
        r.s.low &= lower_mask;
        t += (a >> bits_in_word_2) * (b & lower_mask);
        r.s.low += (t & lower_mask) << bits_in_word_2;
        r.s.high = t >> bits_in_word_2;
        t = r.s.low >> bits_in_word_2;
        r.s.low &= lower_mask;
        t += (b >> bits_in_word_2) * (a & lower_mask);
        r.s.low += (t & lower_mask) << bits_in_word_2;
        r.s.high += t >> bits_in_word_2;
        r.s.high += (a >> bits_in_word_2) * (b >> bits_in_word_2);
 
        return r.all;
}
 
int64_t __muldi3(int64_t a, int64_t b){
        dwords x;
        x.all = a;
        dwords y;
        y.all = b;
        dwords r;
        r.all = __muldsi3(x.s.low, y.s.low);
/*      r.s.high += x.s.high * y.s.low + x.s.low * y.s.high; */
        r.s.high += __mulsi3(x.s.high, y.s.low) + __mulsi3(x.s.low, y.s.high);
 
        return r.all;
}
 
uint32_t __udivmodsi4(uint32_t num, uint32_t den, int32_t modwanted){
        uint32_t bit = 1;
        uint32_t res = 0;
 
        while (den < num && bit && !(den & (1L << 31))) {
                den <<= 1;
                bit <<= 1;
        }
        while (bit){
                if (num >= den){
                        num -= den;
                        res |= bit;
                }
                bit >>= 1;
                den >>= 1;
        }
        if (modwanted)
                return num;
        return res;
}
 
int32_t __divsi3(int32_t a, int32_t b){
        int32_t neg = 0;
        int32_t res;
 
        if (a < 0){
                a = -a;
                neg = !neg;
        }
 
        if (b < 0){
                b = -b;
                neg = !neg;
        }
 
        res = __udivmodsi4(a, b, 0);
 
        if (neg)
                res = -res;
 
        return res;
}
 
int32_t __modsi3(int32_t a, int32_t b){
        int32_t neg = 0;
        int32_t res;
 
        if (a < 0){
                a = -a;
                neg = 1;
        }
 
        if (b < 0)
                b = -b;
 
        res = __udivmodsi4(a, b, 1);
 
        if (neg)
                res = -res;
 
        return res;
}
 
uint32_t __udivsi3 (uint32_t a, uint32_t b){
        return __udivmodsi4(a, b, 0);
}
 
uint32_t __umodsi3 (uint32_t a, uint32_t b){
        return __udivmodsi4(a, b, 1);
}
 
int64_t __ashldi3(int64_t u, uint32_t b){
        dwords uu, w;
        uint32_t bm;
 
        if (b == 0)
                return u;
 
        uu.all = u;
        bm = 32 - b;
 
        if (bm <= 0){
                w.s.low = 0;
                w.s.high = (uint32_t) uu.s.low << -bm;
        }else{
                const uint32_t carries = (uint32_t) uu.s.low >> bm;
 
                w.s.low = (uint32_t) uu.s.low << b;
                w.s.high = ((uint32_t) uu.s.high << b) | carries;
        }
 
        return w.all;
}
 
int64_t __ashrdi3(int64_t u, uint32_t b){
        dwords uu, w;
        uint32_t bm;
 
        if (b == 0)
                return u;
 
        uu.all = u;
        bm = 32 - b;
 
        if (bm <= 0){
                /* w.s.high = 1..1 or 0..0 */
                w.s.high = uu.s.high >> 31;
                w.s.low = uu.s.low >> -bm;
        }else{
                const uint32_t carries = (uint32_t) uu.s.high << bm;
 
                w.s.high = uu.s.high >> b;
                w.s.low = ((uint32_t) uu.s.low >> b) | carries;
        }
 
        return w.all;
}
 
int64_t __lshrdi3(int64_t u, uint32_t b){
        dwords uu, w;
        uint32_t bm;
 
        if (b == 0)
                return u;
 
        uu.all = u;
        bm = 32 - b;
 
        if (bm <= 0){
                w.s.high = 0;
                w.s.low = (uint32_t) uu.s.high >> -bm;
        }else{
                const uint32_t carries = (uint32_t) uu.s.high << bm;
 
                w.s.high = (uint32_t) uu.s.high >> b;
                w.s.low = ((uint32_t) uu.s.low >> b) | carries;
        }
 
        return w.all;
}
 
uint64_t __udivmoddi4(uint64_t num, uint64_t den, uint64_t *rem_p){
        uint64_t quot = 0, qbit = 1;
 
        if (den == 0){
                return 1 / ((uint32_t)den);
        }
 
        while ((int64_t)den >= 0){
                den <<= 1;
                qbit <<= 1;
        }
 
        while (qbit){
                if (den <= num){
                        num -= den;
                        quot += qbit;
                }
                den >>= 1;
                qbit >>= 1;
        }
 
        if (rem_p)
                *rem_p = num;
 
        return quot;
}
 
uint64_t __umoddi3(uint64_t num, uint64_t den){
        uint64_t v;
 
        (void) __udivmoddi4(num, den, &v);
        return v;
}
 
uint64_t __udivdi3(uint64_t num, uint64_t den){
        return __udivmoddi4(num, den, NULL);
}
 
int64_t __moddi3(int64_t num, int64_t den){
        int minus = 0;
        int64_t v;
 
        if (num < 0){
                num = -num;
                minus = 1;
        }
        if (den < 0){
                den = -den;
                minus ^= 1;
        }
 
        (void) __udivmoddi4(num, den, (uint64_t *)&v);
        if (minus)
                v = -v;
 
        return v;
}
 
int64_t __divdi3(int64_t num, int64_t den){
        int minus = 0;
        int64_t v;
 
        if (num < 0){
                num = -num;
                minus = 1;
        }
        if (den < 0){
                den = -den;
                minus ^= 1;
        }
 
        v = __udivmoddi4(num, den, NULL);
        if (minus)
                v = -v;
 
        return v;
}

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[/] [hf-risc/] [trunk/] [software/] [lib/] [libc.c] - Blame information for rev 20

Line No.	Rev	Author	Line
1	13	serginhofr	`/* file: libc.c`
2			`* description: small C library`
3			`* date: 09/2015`
4			`* author: Sergio Johann Filho <sergio.filho@pucrs.br>`
5			`*/`
6
7			`#include <hf-risc.h>`
8
9			`/*`
10			`auxiliary routines`
11			`*/`
12
13			`void uart_init(uint32_t baud){`
14			`uint16_t d;`
15
16			`d = (uint16_t)(CPU_SPEED / baud);`
17			`UART_DIVISOR = d;`
18			`d = UART;`
19			`}`
20
21			`void delay_ms(uint32_t msec){`
22			`volatile uint32_t cur, last, delta, msecs;`
23			`uint32_t cycles_per_msec;`
24
25			`last = COUNTER;`
26			`delta = msecs = 0;`
27			`cycles_per_msec = CPU_SPEED / 1000;`
28			`while(msec > msecs){`
29			`cur = COUNTER;`
30			`if (cur < last)`
31			`delta += (cur + (CPU_SPEED - last));`
32			`else`
33			`delta += (cur - last);`
34			`last = cur;`
35			`if (delta >= cycles_per_msec){`
36			`msecs += delta / cycles_per_msec;`
37			`delta %= cycles_per_msec;`
38			`}`
39			`}`
40			`}`
41
42			`void delay_us(uint32_t usec){`
43			`volatile uint32_t cur, last, delta, usecs;`
44			`uint32_t cycles_per_usec;`
45
46			`last = COUNTER;`
47			`delta = usecs = 0;`
48			`cycles_per_usec = CPU_SPEED / 1000000;`
49			`while(usec > usecs){`
50			`cur = COUNTER;`
51			`if (cur < last)`
52			`delta += (cur + (CPU_SPEED - last));`
53			`else`
54			`delta += (cur - last);`
55			`last = cur;`
56			`if (delta >= cycles_per_usec){`
57			`usecs += delta / cycles_per_usec;`
58			`delta %= cycles_per_usec;`
59			`}`
60			`}`
61			`}`
62
63			`/*`
64			`interrupt management`
65			`*/`
66
67			`static funcptr isr[32];`
68
69			`void interrupt_handler(uint32_t cause, uint32_t *stack){ // called from the ISR`
70			`int32_t i = 0;`
71
72			`do {`
73			`if(cause & 0x1){`
74			`if(isr[i]){`
75			`isr[i](stack);`
76			`}`
77			`}`
78			`cause >>= 1;`
79			`++i;`
80			`} while(cause);`
81			`}`
82
83			`void interrupt_register(uint32_t mask, funcptr ptr){`
84			`int32_t i;`
85
86			`for(i=0;i<32;++i)`
87			`if(mask & (1<<i))`
88			`isr[i] = ptr;`
89			`}`
90
91			`void exception_handler(uint32_t epc, uint32_t opcode)`
92			`{`
93			`}`
94
95			`/*`
96			`minimal custom C library`
97			`*/`
98
99			`#ifndef DEBUG_PORT`
100			`void putchar(int32_t value){ // polled putchar()`
101			`while((IRQ_CAUSE & IRQ_UART_WRITE_AVAILABLE) == 0);`
102			`UART = value;`
103			`}`
104
105			`int32_t kbhit(void){`
106			`return IRQ_CAUSE & IRQ_UART_READ_AVAILABLE;`
107			`}`
108
109			`int32_t getchar(void){ // polled getch()`
110			`while(!kbhit()) ;`
111			`return UART;`
112			`}`
113			`#else`
114			`void putchar(int32_t value){ // polled putchar()`
115			`DEBUG_ADDR = value;`
116			`}`
117
118			`int32_t kbhit(void){`
119			`return 0;`
120			`}`
121
122			`int32_t getchar(void){ // polled getch()`
123			`return DEBUG_ADDR;`
124			`}`
125			`#endif`
126
127			`int8_t strcpy(int8_t dst, const int8_t *src){`
128			`int8_t *dstSave=dst;`
129			`int32_t c;`
130
131			`do{`
132			`c = dst++ = src++;`
133			`} while(c);`
134			`return dstSave;`
135			`}`
136
137			`int8_t strncpy(int8_t s1, int8_t *s2, int32_t n){`
138			`int32_t i;`
139			`int8_t *os1;`
140
141			`os1 = s1;`
142			`for (i = 0; i < n; i++)`
143			`if ((s1++ = s2++) == '\0') {`
144			`while (++i < n)`
145			`*s1++ = '\0';`
146			`return(os1);`
147			`}`
148			`return(os1);`
149			`}`
150
151			`int8_t strcat(int8_t dst, const int8_t *src){`
152			`int32_t c;`
153			`int8_t *dstSave=dst;`
154
155			`while(*dst)`
156			`++dst;`
157			`do{`
158			`c = dst++ = src++;`
159			`} while(c);`
160
161			`return dstSave;`
162			`}`
163
164			`int8_t strncat(int8_t s1, int8_t *s2, int32_t n){`
165			`int8_t *os1;`
166
167			`os1 = s1;`
168			`while (*s1++);`
169			`--s1;`
170			`while ((s1++ = s2++))`
171			`if (--n < 0) {`
172			`*--s1 = '\0';`
173			`break;`
174			`}`
175			`return(os1);`
176			`}`
177
178			`int32_t strcmp(const int8_t s1, const int8_t s2){`
179			`while (s1 == s2++)`
180			`if (*s1++ == '\0')`
181			`return(0);`
182
183			`return(s1 - --s2);`
184			`}`
185
186			`int32_t strncmp(int8_t s1, int8_t s2, int32_t n){`
187			`while (--n >= 0 && s1 == s2++)`
188			`if (*s1++ == '\0')`
189			`return(0);`
190
191			`return(n<0 ? 0 : s1 - --s2);`
192			`}`
193
194			`int8_t strstr(const int8_t string, const int8_t *find){`
195			`int32_t i;`
196	16	serginhofr
197	13	serginhofr	`for(;;){`
198			`for(i = 0; string[i] == find[i] && find[i]; ++i);`
199			`if(find[i] == 0)`
200	16	serginhofr	`return (char *)string;`
201	13	serginhofr	`if(*string++ == 0)`
202			`return NULL;`
203			`}`
204			`}`
205
206			`int32_t strlen(const int8_t *s){`
207			`int32_t n;`
208
209			`n = 0;`
210			`while (*s++)`
211			`n++;`
212
213			`return(n);`
214			`}`
215
216			`int8_t strchr(const int8_t s, int32_t c){`
217			`while (*s != (int8_t)c)`
218			`if (!*s++)`
219			`return 0;`
220
221			`return (int8_t *)s;`
222			`}`
223
224			`int8_t strpbrk(int8_t str, int8_t *set){`
225	16	serginhofr	`int8_t c, *p;`
226
227			`for (c = str; c != 0; str++, c = str) {`
228			`for (p = set; *p != 0; p++) {`
229			`if (c == *p) {`
230			`return str;`
231			`}`
232			`}`
233	13	serginhofr	`}`
234	16	serginhofr	`return 0;`
235
236	13	serginhofr	`}`
237
238			`int8_t strsep(int8_t pp, int8_t delim){`
239			`int8_t p, q;`
240
241			`if (!(p = *pp))`
242			`return 0;`
243	16	serginhofr	`if ((q = strpbrk (p, delim))){`
244	13	serginhofr	`*pp = q + 1;`
245			`*q = '\0';`
246			`}else *pp = 0;`
247
248			`return p;`
249			`}`
250
251			`int8_t strtok(int8_t s, const int8_t *delim){`
252			`const int8_t *spanp;`
253			`int32_t c, sc;`
254			`int8_t *tok;`
255			`static int8_t *last;`
256
257			`if (s == NULL && (s = last) == NULL)`
258			`return (NULL);`
259
260			`cont:`
261			`c = *s++;`
262			`for (spanp = delim; (sc = *spanp++) != 0;){`
263			`if (c == sc)`
264			`goto cont;`
265			`}`
266
267			`if (c == 0){`
268			`last = NULL;`
269			`return (NULL);`
270			`}`
271			`tok = s - 1;`
272
273			`for(;;){`
274			`c = *s++;`
275			`spanp = delim;`
276			`do{`
277			`if ((sc = *spanp++) == c){`
278			`if (c == 0)`
279			`s = NULL;`
280			`else`
281			`s[-1] = 0;`
282			`last = s;`
283			`return (tok);`
284			`}`
285			`}while (sc != 0);`
286			`}`
287			`}`
288
289			`void memcpy(void dst, const void *src, uint32_t n){`
290			`int8_t *r1 = dst;`
291			`const int8_t *r2 = src;`
292
293			`while (n--)`
294			`r1++ = r2++;`
295
296			`return dst;`
297			`}`
298
299			`void memmove(void dst, const void *src, uint32_t n){`
300			`int8_t s = (int8_t )dst;`
301			`const int8_t p = (const int8_t )src;`
302
303			`if (p >= s){`
304			`while (n--)`
305			`s++ = p++;`
306			`}else{`
307			`s += n;`
308			`p += n;`
309			`while (n--)`
310			`--s = --p;`
311			`}`
312
313			`return dst;`
314			`}`
315
316			`int32_t memcmp(const void cs, const void ct, uint32_t n){`
317			`const uint8_t r1 = (const uint8_t )cs;`
318			`const uint8_t r2 = (const uint8_t )ct;`
319
320			`while (n && (r1 == r2)) {`
321			`++r1;`
322			`++r2;`
323			`--n;`
324			`}`
325
326			`return (n == 0) ? 0 : ((r1 < r2) ? -1 : 1);`
327			`}`
328
329			`void memset(void s, int32_t c, uint32_t n){`
330			`uint8_t p = (uint8_t )s;`
331
332			`while (n--)`
333			`*p++ = (uint8_t)c;`
334
335			`return s;`
336			`}`
337
338			`int32_t strtol(const int8_t s, int8_t *end, int32_t base){`
339			`int32_t i;`
340			`uint32_t ch, value=0, neg=0;`
341
342			`if(s[0] == '-'){`
343			`neg = 1;`
344			`++s;`
345			`}`
346			`if(s[0] == '0' && s[1] == 'x'){`
347			`base = 16;`
348			`s += 2;`
349			`}`
350			`for(i = 0; i <= 8; ++i){`
351			`ch = *s++;`
352			`if('0' <= ch && ch <= '9')`
353			`ch -= '0';`
354			`else if('A' <= ch && ch <= 'Z')`
355			`ch = ch - 'A' + 10;`
356			`else if('a' <= ch && ch <= 'z')`
357			`ch = ch - 'a' + 10;`
358			`else`
359			`break;`
360			`value = value * base + ch;`
361			`}`
362			`if(end)`
363			`end = (char)s - 1;`
364			`if(neg)`
365			`value = -(int32_t)value;`
366			`return value;`
367			`}`
368
369			`int32_t atoi(const int8_t *s){`
370			`int32_t n, f;`
371
372			`n = 0;`
373			`f = 0;`
374			`for(;;s++){`
375			`switch(*s){`
376			`case ' ':`
377			`case '\t':`
378			`continue;`
379			`case '-':`
380			`f++;`
381			`case '+':`
382			`s++;`
383			`}`
384			`break;`
385			`}`
386			`while(s >= '0' && s <= '9')`
387			`n = n10 + s++ - '0';`
388			`return(f?-n:n);`
389			`}`
390
391			`int8_t itoa(int32_t i, int8_t s, int32_t base){`
392			`int8_t ptr = s, ptr1 = s, tmp_char;`
393			`int32_t tmp_value;`
394
395			`if (base < 2 \|\| base > 36) {`
396			`*s = '\0';`
397			`return s;`
398			`}`
399			`do {`
400			`tmp_value = i;`
401			`i /= base;`
402			`ptr++ = "zyxwvutsrqponmlkjihgfedcba9876543210123456789abcdefghijklmnopqrstuvwxyz" [35 + (tmp_value - i base)];`
403			`} while (i);`
404			`if (tmp_value < 0)`
405			`*ptr++ = '-';`
406			`*ptr-- = '\0';`
407			`while(ptr1 < ptr) {`
408			`tmp_char = *ptr;`
409			`ptr--= ptr1;`
410			`*ptr1++ = tmp_char;`
411			`}`
412			`return s;`
413			`}`
414
415			`int32_t puts(const int8_t *str){`
416			`while(*str)`
417			`putchar(*str++);`
418			`putchar('\n');`
419
420			`return 0;`
421			`}`
422
423			`int8_t gets(int8_t s){`
424			`int32_t c;`
425			`int8_t *cs;`
426
427			`cs = s;`
428			`while ((c = getchar()) != '\n' && c >= 0)`
429			`*cs++ = c;`
430			`if (c<0 && cs==s)`
431			`return(NULL);`
432			`*cs++ = '\0';`
433			`return(s);`
434			`}`
435
436			`int32_t abs(int32_t n){`
437			`return n>=0 ? n:-n;`
438			`}`
439
440			`static uint32_t rand1=0xbaadf00d;`
441
442			`int32_t random(void){`
443			`rand1 = rand1 * 1103515245 + 12345;`
444			`return (uint32_t)(rand1 >> 16) & 32767;`
445			`}`
446
447			`void srand(uint32_t seed){`
448			`rand1 = seed;`
449			`}`
450
451			`/*`
452			`printf() and sprintf()`
453			`*/`
454			`#include <stdarg.h>`
455			`#define PAD_RIGHT 1`
456			`#define PAD_ZERO 2`
457			`#define PRINT_BUF_LEN 30`
458
459			`static void printchar(int8_t **str, int32_t c){`
460			`if (str){`
461			`**str = c;`
462			`++(*str);`
463			`} else`
464			`(void)putchar(c);`
465			`}`
466
467			`static int32_t prints(int8_t *out, const int8_t string, int32_t width, int32_t pad){`
468			`int32_t pc = 0, padchar = ' ';`
469
470			`if (width > 0){`
471			`int32_t len = 0;`
472			`const int8_t *ptr;`
473			`for (ptr = string; *ptr; ++ptr) ++len;`
474			`if (len >= width) width = 0;`
475			`else width -= len;`
476			`if (pad & PAD_ZERO) padchar = '0';`
477			`}`
478			`if (!(pad & PAD_RIGHT)){`
479			`for ( ; width > 0; --width){`
480			`printchar (out, padchar);`
481			`++pc;`
482			`}`
483			`}`
484			`for ( ; *string ; ++string){`
485			`printchar (out, *string);`
486			`++pc;`
487			`}`
488			`for ( ; width > 0; --width){`
489			`printchar (out, padchar);`
490			`++pc;`
491			`}`
492
493			`return pc;`
494			`}`
495
496			`static int32_t printi(int8_t **out, int32_t i, int32_t b, int32_t sg, int32_t width, int32_t pad, int32_t letbase){`
497			`int8_t print_buf[PRINT_BUF_LEN];`
498			`int8_t *s;`
499			`int32_t t, neg = 0, pc = 0;`
500			`uint32_t u = i;`
501
502			`if (i == 0){`
503			`print_buf[0] = '0';`
504			`print_buf[1] = '\0';`
505			`return prints (out, print_buf, width, pad);`
506			`}`
507
508			`if (sg && b == 10 && i < 0){`
509			`neg = 1;`
510			`u = -i;`
511			`}`
512
513			`s = print_buf + PRINT_BUF_LEN-1;`
514			`*s = '\0';`
515
516			`while (u){`
517			`t = u % b;`
518			`if( t >= 10 )`
519			`t += letbase - '0' - 10;`
520			`*--s = t + '0';`
521			`u /= b;`
522			`}`
523
524			`if (neg){`
525			`if(width && (pad & PAD_ZERO)){`
526			`printchar (out, '-');`
527			`++pc;`
528			`--width;`
529			`}`
530			`else {`
531			`*--s = '-';`
532			`}`
533			`}`
534
535			`return pc + prints (out, s, width, pad);`
536			`}`
537
538			`static int32_t print(int8_t *out, const int8_t format, va_list args){`
539			`int32_t width, pad;`
540			`int32_t pc = 0;`
541			`int8_t scr[2];`
542
543			`for (; *format != 0; ++format){`
544			`if (*format == '%'){`
545			`++format;`
546			`width = pad = 0;`
547			`if (*format == '\0') break;`
548			`if (*format == '%') goto out;`
549			`if (*format == '-'){`
550			`++format;`
551			`pad = PAD_RIGHT;`
552			`}`
553			`while (*format == '0'){`
554			`++format;`
555			`pad \|= PAD_ZERO;`
556			`}`
557			`for (; format >= '0' && format <= '9'; ++format){`
558			`width *= 10;`
559			`width += *format - '0';`
560			`}`
561			`if(*format == 's'){`
562			`int8_t s = (int8_t )va_arg(args, int32_t);`
563			`pc += prints(out, s?s:"(null)", width, pad);`
564			`continue;`
565			`}`
566			`if(*format == 'd'){`
567			`pc += printi(out, va_arg(args, int32_t), 10, 1, width, pad, 'a');`
568			`continue;`
569			`}`
570			`if(*format == 'x'){`
571			`pc += printi(out, va_arg(args, int32_t), 16, 0, width, pad, 'a');`
572			`continue;`
573			`}`
574			`if(*format == 'X'){`
575			`pc += printi(out, va_arg(args, int32_t), 16, 0, width, pad, 'A');`
576			`continue;`
577			`}`
578			`if(*format == 'u'){`
579			`pc += printi(out, va_arg(args, int32_t), 10, 0, width, pad, 'a');`
580			`continue;`
581			`}`
582			`if(*format == 'c'){`
583			`/* char are converted to int then pushed on the stack */`
584			`scr[0] = (int8_t)va_arg(args, int32_t);`
585			`scr[1] = '\0';`
586			`pc += prints(out, scr, width, pad);`
587			`continue;`
588			`}`
589			`}`
590			`else {`
591			`out:`
592			`printchar(out, *format);`
593			`++pc;`
594			`}`
595			`}`
596			`if (out) **out = '\0';`
597			`va_end( args );`
598			`return pc;`
599			`}`
600
601			`int printf(const int8_t *fmt, ...){`
602			`va_list args;`
603
604			`va_start(args, fmt);`
605			`return print(0, fmt, args);`
606			`}`
607
608			`int sprintf(int8_t out, const int8_t fmt, ...){`
609			`va_list args;`
610
611			`va_start(args, fmt);`
612			`return print(&out, fmt, args);`
613			`}`
614
615			`/*`
616			`software implementation of multiply/divide and 64-bit routines`
617			`*/`
618
619			`typedef union{`
620			`int64_t all;`
621			`struct{`
622			`#if LITTLE_ENDIAN`
623			`uint32_t low;`
624			`int32_t high;`
625			`#else`
626			`int32_t high;`
627			`uint32_t low;`
628			`#endif`
629			`} s;`
630			`} dwords;`
631
632			`int32_t __mulsi3(uint32_t a, uint32_t b){`
633			`uint32_t answer = 0;`
634
635			`while(b){`
636			`if(b & 1)`
637			`answer += a;`
638			`a <<= 1;`
639			`b >>= 1;`
640			`}`
641			`return answer;`
642			`}`
643
644			`int64_t __muldsi3(uint32_t a, uint32_t b){`
645			`dwords r;`
646
647			`const int32_t bits_in_word_2 = (int32_t)(sizeof(int32_t) * 8) / 2;`
648			`const uint32_t lower_mask = (uint32_t)~0 >> bits_in_word_2;`
649			`r.s.low = (a & lower_mask) * (b & lower_mask);`
650			`uint32_t t = r.s.low >> bits_in_word_2;`
651			`r.s.low &= lower_mask;`
652			`t += (a >> bits_in_word_2) * (b & lower_mask);`
653			`r.s.low += (t & lower_mask) << bits_in_word_2;`
654			`r.s.high = t >> bits_in_word_2;`
655			`t = r.s.low >> bits_in_word_2;`
656			`r.s.low &= lower_mask;`
657			`t += (b >> bits_in_word_2) * (a & lower_mask);`
658			`r.s.low += (t & lower_mask) << bits_in_word_2;`
659			`r.s.high += t >> bits_in_word_2;`
660			`r.s.high += (a >> bits_in_word_2) * (b >> bits_in_word_2);`
661
662			`return r.all;`
663			`}`
664
665			`int64_t __muldi3(int64_t a, int64_t b){`
666			`dwords x;`
667			`x.all = a;`
668			`dwords y;`
669			`y.all = b;`
670			`dwords r;`
671			`r.all = __muldsi3(x.s.low, y.s.low);`
672			`/* r.s.high += x.s.high * y.s.low + x.s.low * y.s.high; */`
673			`r.s.high += __mulsi3(x.s.high, y.s.low) + __mulsi3(x.s.low, y.s.high);`
674
675			`return r.all;`
676			`}`
677
678			`uint32_t __udivmodsi4(uint32_t num, uint32_t den, int32_t modwanted){`
679			`uint32_t bit = 1;`
680			`uint32_t res = 0;`
681
682			`while (den < num && bit && !(den & (1L << 31))) {`
683			`den <<= 1;`
684			`bit <<= 1;`
685			`}`
686			`while (bit){`
687			`if (num >= den){`
688			`num -= den;`
689			`res \|= bit;`
690			`}`
691			`bit >>= 1;`
692			`den >>= 1;`
693			`}`
694			`if (modwanted)`
695			`return num;`
696			`return res;`
697			`}`
698
699			`int32_t __divsi3(int32_t a, int32_t b){`
700			`int32_t neg = 0;`
701			`int32_t res;`
702
703			`if (a < 0){`
704			`a = -a;`
705			`neg = !neg;`
706			`}`
707
708			`if (b < 0){`
709			`b = -b;`
710			`neg = !neg;`
711			`}`
712
713			`res = __udivmodsi4(a, b, 0);`
714
715			`if (neg)`
716			`res = -res;`
717
718			`return res;`
719			`}`
720
721			`int32_t __modsi3(int32_t a, int32_t b){`
722			`int32_t neg = 0;`
723			`int32_t res;`
724
725			`if (a < 0){`
726			`a = -a;`
727			`neg = 1;`
728			`}`
729
730			`if (b < 0)`
731			`b = -b;`
732
733			`res = __udivmodsi4(a, b, 1);`
734
735			`if (neg)`
736			`res = -res;`
737
738			`return res;`
739			`}`
740
741			`uint32_t __udivsi3 (uint32_t a, uint32_t b){`
742			`return __udivmodsi4(a, b, 0);`
743			`}`
744
745			`uint32_t __umodsi3 (uint32_t a, uint32_t b){`
746			`return __udivmodsi4(a, b, 1);`
747			`}`
748
749			`int64_t __ashldi3(int64_t u, uint32_t b){`
750			`dwords uu, w;`
751			`uint32_t bm;`
752
753			`if (b == 0)`
754			`return u;`
755
756			`uu.all = u;`
757			`bm = 32 - b;`
758
759			`if (bm <= 0){`
760			`w.s.low = 0;`
761			`w.s.high = (uint32_t) uu.s.low << -bm;`
762			`}else{`
763			`const uint32_t carries = (uint32_t) uu.s.low >> bm;`
764
765			`w.s.low = (uint32_t) uu.s.low << b;`
766			`w.s.high = ((uint32_t) uu.s.high << b) \| carries;`
767			`}`
768
769			`return w.all;`
770			`}`
771
772			`int64_t __ashrdi3(int64_t u, uint32_t b){`
773			`dwords uu, w;`
774			`uint32_t bm;`
775
776			`if (b == 0)`
777			`return u;`
778
779			`uu.all = u;`
780			`bm = 32 - b;`
781
782			`if (bm <= 0){`
783			`/* w.s.high = 1..1 or 0..0 */`
784			`w.s.high = uu.s.high >> 31;`
785			`w.s.low = uu.s.low >> -bm;`
786			`}else{`
787			`const uint32_t carries = (uint32_t) uu.s.high << bm;`
788
789			`w.s.high = uu.s.high >> b;`
790			`w.s.low = ((uint32_t) uu.s.low >> b) \| carries;`
791			`}`
792
793			`return w.all;`
794			`}`
795
796			`int64_t __lshrdi3(int64_t u, uint32_t b){`
797			`dwords uu, w;`
798			`uint32_t bm;`
799
800			`if (b == 0)`
801			`return u;`
802
803			`uu.all = u;`
804			`bm = 32 - b;`
805
806			`if (bm <= 0){`
807			`w.s.high = 0;`
808			`w.s.low = (uint32_t) uu.s.high >> -bm;`
809			`}else{`
810			`const uint32_t carries = (uint32_t) uu.s.high << bm;`
811
812			`w.s.high = (uint32_t) uu.s.high >> b;`
813			`w.s.low = ((uint32_t) uu.s.low >> b) \| carries;`
814			`}`
815
816			`return w.all;`
817			`}`
818
819			`uint64_t __udivmoddi4(uint64_t num, uint64_t den, uint64_t *rem_p){`
820			`uint64_t quot = 0, qbit = 1;`
821
822			`if (den == 0){`
823			`return 1 / ((uint32_t)den);`
824			`}`
825
826			`while ((int64_t)den >= 0){`
827			`den <<= 1;`
828			`qbit <<= 1;`
829			`}`
830
831			`while (qbit){`
832			`if (den <= num){`
833			`num -= den;`
834			`quot += qbit;`
835			`}`
836			`den >>= 1;`
837			`qbit >>= 1;`
838			`}`
839
840			`if (rem_p)`
841			`*rem_p = num;`
842
843			`return quot;`
844			`}`
845
846			`uint64_t __umoddi3(uint64_t num, uint64_t den){`
847			`uint64_t v;`
848
849			`(void) __udivmoddi4(num, den, &v);`
850			`return v;`
851			`}`
852
853			`uint64_t __udivdi3(uint64_t num, uint64_t den){`
854			`return __udivmoddi4(num, den, NULL);`
855			`}`
856
857			`int64_t __moddi3(int64_t num, int64_t den){`
858			`int minus = 0;`
859			`int64_t v;`
860
861			`if (num < 0){`
862			`num = -num;`
863			`minus = 1;`
864			`}`
865			`if (den < 0){`
866			`den = -den;`
867			`minus ^= 1;`
868			`}`
869
870			`(void) __udivmoddi4(num, den, (uint64_t *)&v);`
871			`if (minus)`
872			`v = -v;`
873
874			`return v;`
875			`}`
876
877			`int64_t __divdi3(int64_t num, int64_t den){`
878			`int minus = 0;`
879			`int64_t v;`
880
881			`if (num < 0){`
882			`num = -num;`
883			`minus = 1;`
884			`}`
885			`if (den < 0){`
886			`den = -den;`
887			`minus ^= 1;`
888			`}`
889
890			`v = __udivmoddi4(num, den, NULL);`
891			`if (minus)`
892			`v = -v;`
893
894			`return v;`
895			`}`