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36 lines
746 B
36 lines
746 B
5 years ago
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/* Do not use this as the basis of your own libc.
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* The code is probably unoptimal or wonky, as I
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* had no prior experience with this, but instead
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* just fiddled with the code until it worked.
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*/
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#include<stdio.h>
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#define STDOUT 1
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#define SYS_WRITE 4
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int simple_print(const char *msg, const long bufsize) {
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int count;
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long total_written = 0;
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while(total_written < bufsize) {
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asm(
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"int $0x80\n\t"
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: "=a"(count)
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: "0"(SYS_WRITE), "b"(STDOUT), "c"(msg+total_written), "d"(bufsize-total_written)
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:);
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if(count == 0) {
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return 1;
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}
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total_written += count;
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}
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return 0;
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}
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int simple_strlen(const char *str) {
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int len = 0;
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while(str[len] != '\0') {
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len++;
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}
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return len;
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}
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