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Add strcmp and readline

master
Mathieu Maret 3 months ago committed by Mathieu Maret
parent
commit
9ffa7dde85
  1. 61
      utils.c
  2. 2
      utils.h

61
utils.c

@ -1,25 +1,25 @@
#include <stdint.h>
#include "uart.h"
#include "clock.h"
#include "uart.h"
#include <stdint.h>
// K&R inspirated
void printhex(unsigned int d)
{
char n;
for(int c=28;c>=0;c-=4) {
for (int c = 28; c >= 0; c -= 4) {
// get highest tetrad
n=(d>>c)&0xF;
n = (d >> c) & 0xF;
// 0-9 => '0'-'9', 10-15 => 'A'-'F'
n+=n>9?0x37:0x30;
n += n > 9 ? 0x37 : 0x30;
putc(n);
}
}
int strlen(char s[])
{
int i=0;
while(s[i]!= '\0') {
int i = 0;
while (s[i] != '\0') {
++i;
}
return i;
@ -28,20 +28,20 @@ int strlen(char s[])
void reverse(char s[])
{
int c, i, j;
for(i=0, j=strlen(s)-1; i<j; i++, j--) {
c=s[i];
s[i]=s[j];
s[j]=c;
for (i = 0, j = strlen(s) - 1; i < j; i++, j--) {
c = s[i];
s[i] = s[j];
s[j] = c;
}
}
void itoa(unsigned int n, char s[])
{
int i=0;
int i = 0;
do {
s[i++]=n%10+'0';
} while((n/=10)>0);
s[i]='\0';
s[i++] = n % 10 + '0';
} while ((n /= 10) > 0);
s[i] = '\0';
reverse(s);
}
@ -49,7 +49,7 @@ void printdec(unsigned int d)
{
char s[16];
itoa(d, s);
for(int i=0; i<strlen(s); i++) {
for (int i = 0; i < strlen(s); i++) {
putc(s[i]);
}
}
@ -61,7 +61,7 @@ void printclock()
"PWM", "HEVC", "EMMC2", "M2MC", "PIXEL_BVB"};
puts("Clocks:\n");
for(int i =1; i <= CLK_PIXEL_BVB; i++ ){
for (int i = 1; i <= CLK_PIXEL_BVB; i++) {
puts(" ");
puts(clocktxts[i]);
puts(": ");
@ -71,3 +71,30 @@ void printclock()
puts(" Hz\n");
}
}
int readline(char *buf, int maxlen)
{
int num = 0;
while (num < maxlen - 1) {
char c = uart_recv();
// It seems like screen sends \r when I press enter
if (c == '\n' || c == '\0' || c == '\r') {
break;
}
buf[num] = c;
num++;
}
buf[num] = '\0';
return num;
}
// Returns <0 if s1<s2, 0 if s1==s2, >0 if s1>s2
int strcmp(const char s1[], const char s2[])
{
int i;
for (i = 0; s1[i] == s2[i]; i++) {
if (s1[i] == '\0')
return 0;
}
return s1[i] - s2[i];
}

2
utils.h

@ -6,3 +6,5 @@ void reverse(char s[]);
void itoa(unsigned int n, char s[]);
void printdec(unsigned int d);
void printclock();
int strcmp(const char s1[], const char s2[]);
int readline(char *buf, int maxlen);

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