42 lines
823 B
C
42 lines
823 B
C
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#include <string.h>
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#include <sys/ksys.h>
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char *__reverse(char *str)
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{
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char tmp, *src, *dst;
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size_t len;
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if (str != NULL){
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len = strlen (str);
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if (len > 1) {
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src = str;
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dst = src + len - 1;
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while (src < dst) {
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tmp = *src;
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*src++ = *dst;
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*dst-- = tmp;
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}
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}
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}
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return str;
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}
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/* itoa from K&R */
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void itoa(int n, char s[])
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{
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int i, sign;
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if ((sign = n) < 0) /* record sign */
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n = -n; /* make n positive */
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i = 0;
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do { /* generate digits in reverse order */
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s[i++] = n % 10 + '0'; /* get next digit */
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} while ((n /= 10) > 0); /* delete it */
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if (sign < 0)
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s[i++] = '-';
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__reverse(s);
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s[i] = '\0';
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return;
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}
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