Fossil SCM
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#include "stdio.h" |
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#include "stdlib.h" |
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/** |
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* Reads hexadecimal values from stdin and writes binary bytes to stdout. |
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* Accepts hex values separated by spaces, newlines, commas, etc. |
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* Handles both uppercase and lowercase hex digits. |
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*/ |
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int main(void) { |
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char hexStr[3]; // Two hex digits + null terminator |
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int ch; |
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// Read characters until EOF |
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while((ch = getchar()) != EOF) { |
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hexStr[0] = (char)ch; |
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hexStr[1] = (char)getchar(); |
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hexStr[2] = '\0'; // Null-terminate string |
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char *endptr; |
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unsigned char byte = (unsigned char)strtol(hexStr, &endptr, 16); |
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fwrite(&byte, 1, 1, stdout); |
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if((ch = getchar()) == EOF) // Read seaparating space |
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break; |
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} |
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return 0; |
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} |
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