71 lines
1.5 KiB
Plaintext
71 lines
1.5 KiB
Plaintext
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// Public domain / CC0. Use freely for any purpose. RoyR 2026
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// strings.cm - String manipulation
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// Demonstrates: string literals, character arrays, string functions
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void printf(uint8 *fmt);
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int32 str_len(uint8 *s) {
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int32 len = 0;
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while (s[len]) {
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len = len + 1;
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}
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return len;
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}
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void str_copy(uint8 *dest, uint8 *src) {
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int32 i = 0;
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while (src[i]) {
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dest[i] = src[i];
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i = i + 1;
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}
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dest[i] = 0;
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}
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int32 str_cmp(uint8 *s1, uint8 *s2) {
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int32 i = 0;
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while (s1[i] && s2[i]) {
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if (s1[i] != s2[i]) {
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return s1[i] - s2[i];
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}
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i = i + 1;
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}
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return s1[i] - s2[i];
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}
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void str_reverse(uint8 *s) {
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int32 len = str_len(s);
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int32 i = 0;
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int32 j = len - 1;
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while (i < j) {
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uint8 temp = s[i];
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s[i] = s[j];
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s[j] = temp;
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i = i + 1;
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j = j - 1;
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}
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}
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int32 main(void) {
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uint8 *msg = "Hello, World!";
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printf("Original string: %s\n", msg);
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printf("Length: %d\n", str_len(msg));
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uint8 buffer[100];
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str_copy(buffer, msg);
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printf("Copied string: %s\n", buffer);
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str_reverse(buffer);
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printf("Reversed: %s\n", buffer);
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uint8 *s1 = "apple";
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uint8 *s2 = "banana";
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uint8 *s3 = "apple";
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printf("\nString comparison:\n");
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printf(" '%s' vs '%s': %d\n", s1, s2, str_cmp(s1, s2));
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printf(" '%s' vs '%s': %d\n", s1, s3, str_cmp(s1, s3));
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printf(" '%s' vs '%s': %d\n", s2, s1, str_cmp(s2, s1));
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return 0;
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}
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