80 lines
1.4 KiB
C
80 lines
1.4 KiB
C
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#include "string.h"
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/**
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* K&R implementation
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*/
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void int_to_ascii(int n, char str[]) {
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int i, sign;
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if ((sign = n) < 0) n = -n;
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i = 0;
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do {
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str[i++] = n % 10 + '0';
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} while ((n /= 10) > 0);
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if (sign < 0) str[i++] = '-';
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str[i] = '\0';
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reverse(str);
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}
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void hex_to_ascii(int n, char str[]) {
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str[0] = 0;
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append(str, '0');
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append(str, 'x');
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char zeros = 0;
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s32 tmp;
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int i;
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for (i = 28; i > 0; i -= 4) {
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tmp = (n >> i) & 0xF;
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if (tmp == 0 && zeros == 0) continue;
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zeros = 1;
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if (tmp > 0x0A) append(str, tmp - 0x0a + 'a');
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else append(str, tmp + '0');
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}
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tmp = n & 0xF;
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if (tmp >= 0x0A) append(str, tmp - 0x0a + 'a');
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else append(str, tmp + '0');
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return;
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}
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/* K&R */
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void reverse(char s[]) {
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int c, i, j;
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for (i = 0, j = strlen(s)-1; i < j; i++, j--) {
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c = s[i];
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s[i] = s[j];
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s[j] = c;
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}
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}
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/* K&R */
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int strlen(char s[]) {
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int i = 0;
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while (s[i] != '\0') ++i;
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return i;
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}
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void append(char s[], char n) {
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int len = strlen(s);
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s[len] = n;
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s[len+1] = '\0';
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}
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void backspace(char s[]) {
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int len = strlen(s);
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s[len-1] = '\0';
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}
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/* K&R
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* Returns <0 if s1<s2, 0 if s1==s2, >0 if s1>s2 */
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int strcmp(char s1[], char s2[]) {
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int i;
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for (i = 0; s1[i] == s2[i]; i++) {
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if (s1[i] == '\0') return 0;
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}
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return s1[i] - s2[i];
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}
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