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[/] [eco32/] [trunk/] [monitor/] [monitor/] [common/] [getline.c] - Blame information for rev 317

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Line No. Rev Author Line
1 59 hellwig
/*
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 * getline.c -- line input
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 */
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#include "common.h"
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#include "stdarg.h"
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#include "romlib.h"
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#include "getline.h"
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#define MAX_HISTORY     20
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static char history[MAX_HISTORY][80];
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static int historyIndex;  /* next line to be written */
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/*
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 * Get a line from the console.
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 */
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char *getLine(char *prompt) {
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  static char line[80];
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  int index;
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  int historyPointer;
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  char c;
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  int i;
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  printf(prompt);
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  index = 0;
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  historyPointer = historyIndex;
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  while (1) {
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    c = getchar();
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    switch (c) {
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      case '\r':
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        putchar('\n');
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        line[index] = '\0';
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        return line;
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      case '\b':
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      case 0x7F:
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        if (index == 0) {
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          break;
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        }
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        putchar('\b');
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        putchar(' ');
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        putchar('\b');
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        index--;
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        break;
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      case 'P' & ~0x40:
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        if (historyPointer == historyIndex) {
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          line[index] = '\0';
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          strcpy(history[historyIndex], line);
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        }
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        i = historyPointer - 1;
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        if (i == -1) {
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          i = MAX_HISTORY - 1;
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        }
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        if (i == historyIndex) {
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          putchar('\a');
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          break;
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        }
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        if (history[i][0] == '\0') {
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          putchar('\a');
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          break;
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        }
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        historyPointer = i;
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        strcpy(line, history[historyPointer]);
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        printf("\r");
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        for (i = 0; i < 79; i++) {
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          printf(" ");
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        }
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        printf("\r");
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        printf(prompt);
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        printf(line);
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        index = strlen(line);
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        break;
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      case 'N' & ~0x40:
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        if (historyPointer == historyIndex) {
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          putchar('\a');
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          break;
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        }
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        i = historyPointer + 1;
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        if (i == MAX_HISTORY) {
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          i = 0;
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        }
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        historyPointer = i;
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        strcpy(line, history[historyPointer]);
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        printf("\r");
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        for (i = 0; i < 79; i++) {
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          printf(" ");
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        }
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        printf("\r");
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        printf(prompt);
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        printf(line);
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        index = strlen(line);
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        break;
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      default:
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        if (c == '\t') {
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          c = ' ';
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        }
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        if (c < 0x20 || c > 0x7E) {
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          break;
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        }
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        putchar(c);
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        line[index++] = c;
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        break;
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    }
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  }
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  /* never reached */
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  return NULL;
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}
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/*
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 * Add a line to the history.
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 * Don't do this if the line is empty, or if its
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 * contents exactly match the previous line.
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 */
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void addHist(char *line) {
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  int lastWritten;
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  if (*line == '\0') {
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    return;
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  }
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  lastWritten = historyIndex - 1;
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  if (lastWritten == -1) {
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    lastWritten = MAX_HISTORY - 1;
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  }
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  if (strcmp(history[lastWritten], line) == 0) {
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    return;
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  }
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  strcpy(history[historyIndex], line);
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  if (++historyIndex == MAX_HISTORY) {
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    historyIndex = 0;
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  }
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}

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