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[/] [eco32/] [tags/] [eco32-0.22/] [monitor/] [monitor/] [getline.c] - Rev 224
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/* * getline.c -- line input */ #include "common.h" #include "stdarg.h" #include "romlib.h" #include "getline.h" #define MAX_HISTORY 100 static char history[MAX_HISTORY][80]; static int historyIndex; /* next line to be written */ /* * Get a line from the console. */ char *getLine(char *prompt) { static char line[80]; int index; int historyPointer; char c; int i; printf(prompt); index = 0; historyPointer = historyIndex; while (1) { c = getchar(); switch (c) { case '\r': putchar('\n'); line[index] = '\0'; return line; case '\b': case 0x7F: if (index == 0) { break; } putchar('\b'); putchar(' '); putchar('\b'); index--; break; case 'P' & ~0x40: if (historyPointer == historyIndex) { line[index] = '\0'; strcpy(history[historyIndex], line); } i = historyPointer - 1; if (i == -1) { i = MAX_HISTORY - 1; } if (i == historyIndex) { putchar('\a'); break; } if (history[i][0] == '\0') { putchar('\a'); break; } historyPointer = i; strcpy(line, history[historyPointer]); printf("\r"); for (i = 0; i < 79; i++) { printf(" "); } printf("\r"); printf(prompt); printf(line); index = strlen(line); break; case 'N' & ~0x40: if (historyPointer == historyIndex) { putchar('\a'); break; } i = historyPointer + 1; if (i == MAX_HISTORY) { i = 0; } historyPointer = i; strcpy(line, history[historyPointer]); printf("\r"); for (i = 0; i < 79; i++) { printf(" "); } printf("\r"); printf(prompt); printf(line); index = strlen(line); break; default: if (c == '\t') { c = ' '; } if (c < 0x20 || c > 0x7E) { break; } putchar(c); line[index++] = c; break; } } /* never reached */ return NULL; } /* * Add a line to the history. * Don't do this if the line is empty, or if its * contents exactly match the previous line. */ void addHist(char *line) { int lastWritten; if (*line == '\0') { return; } lastWritten = historyIndex - 1; if (lastWritten == -1) { lastWritten = MAX_HISTORY - 1; } if (strcmp(history[lastWritten], line) == 0) { return; } strcpy(history[historyIndex], line); if (++historyIndex == MAX_HISTORY) { historyIndex = 0; } }
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