126 lines
2 KiB
C
126 lines
2 KiB
C
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static char *histfile;
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static char **history;
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static size_t histsz, histpos;
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static void
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loadhistory(void)
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{
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FILE *fp = NULL;
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static size_t cap = 0;
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size_t llen;
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char *line;
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if (!histfile) {
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return;
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}
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fp = fopen(histfile, "r");
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if (!fp) {
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return;
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}
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for (;;) {
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line = NULL;
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llen = 0;
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if (-1 == getline(&line, &llen, fp)) {
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if (ferror(fp)) {
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die("failed to read history");
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}
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free(line);
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break;
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}
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if (cap == histsz) {
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cap += 64 * sizeof(char*);
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history = realloc(history, cap);
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if (!history) {
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die("failed to realloc memory");
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}
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}
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strtok(line, "\n");
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history[histsz] = line;
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histsz++;
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}
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histpos = histsz;
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if (fclose(fp)) {
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die("failed to close file %s", histfile);
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}
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}
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static void
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navhistory(int dir)
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{
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static char def[BUFSIZ];
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char *p = NULL;
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size_t len = 0;
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if (!history || histpos + 1 == 0)
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return;
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if (histsz == histpos) {
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strncpy(def, text, sizeof(def));
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}
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switch(dir) {
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case 1:
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if (histpos < histsz - 1) {
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p = history[++histpos];
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} else if (histpos == histsz - 1) {
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p = def;
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histpos++;
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}
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break;
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case -1:
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if (histpos > 0) {
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p = history[--histpos];
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}
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break;
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}
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if (p == NULL) {
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return;
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}
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len = MIN(strlen(p), BUFSIZ - 1);
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strncpy(text, p, len);
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text[len] = '\0';
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cursor = len;
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match();
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}
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static void
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savehistory(char *input)
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{
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unsigned int i;
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FILE *fp;
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if (!histfile ||
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0 == maxhist ||
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0 == strlen(input)) {
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goto out;
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}
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fp = fopen(histfile, "w");
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if (!fp) {
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die("failed to open %s", histfile);
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}
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for (i = histsz < maxhist ? 0 : histsz - maxhist; i < histsz; i++) {
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if (0 >= fprintf(fp, "%s\n", history[i])) {
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die("failed to write to %s", histfile);
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}
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}
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if (histsz == 0 || !histnodup || (histsz > 0 && strcmp(input, history[histsz-1]) != 0)) { /* TODO */
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if (0 >= fputs(input, fp)) {
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die("failed to write to %s", histfile);
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}
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}
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if (fclose(fp)) {
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die("failed to close file %s", histfile);
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}
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out:
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for (i = 0; i < histsz; i++) {
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free(history[i]);
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}
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free(history);
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}
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