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}
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}
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static void buildprompt(char *s, unsigned short envseg) {
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static void buildprompt(char *s, unsigned short envseg) {
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  /* locate the prompt variable or use the default pattern */
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  /* locate the prompt variable or use the default pattern */
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  const char far *fmt = env_lookup(envseg, "PROMPT");
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  const char far *fmt = env_lookup_val(envseg, "PROMPT");
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  while ((fmt != NULL) && (*fmt != 0)) {
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    fmt++;
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    if (fmt[-1] == '=') break;
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  }
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  if ((fmt == NULL) || (*fmt == 0)) fmt = "$p$g"; /* fallback to default if empty */
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  if ((fmt == NULL) || (*fmt == 0)) fmt = "$p$g"; /* fallback to default if empty */
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  /* build the prompt string based on pattern */
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  /* build the prompt string based on pattern */
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  for (; *fmt != 0; fmt++) {
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  for (; *fmt != 0; fmt++) {
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    if (*fmt != '$') {
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    if (*fmt != '$') {
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      *s = *fmt;
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      *s = *fmt;