45 lines
725 B
C
45 lines
725 B
C
#include <inc/stdio.h>
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#include <inc/error.h>
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#define BUFLEN 1024
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static char buf[BUFLEN];
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char *
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readline(const char *prompt)
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{
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int i, c, echoing;
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#if JOS_KERNEL
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if (prompt != NULL)
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cprintf("%s", prompt);
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#else
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if (prompt != NULL)
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fprintf(1, "%s", prompt);
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#endif
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i = 0;
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echoing = iscons(0);
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while (1) {
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c = getchar();
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if (c < 0) {
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if (c != -E_EOF)
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cprintf("read error: %e\n", c);
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return NULL;
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} else if ((c == '\b' || c == '\x7f') && i > 0) {
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if (echoing)
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cputchar('\b');
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i--;
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} else if (c >= ' ' && i < BUFLEN-1) {
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if (echoing)
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cputchar(c);
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buf[i++] = c;
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} else if (c == '\n' || c == '\r') {
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if (echoing)
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cputchar('\n');
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buf[i] = 0;
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return buf;
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}
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}
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}
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