rapida/c/utils.c

/* SPDX-License-Identifier: GPL-3.0-or-later */
/* Copyright 2022 Ivan Polyakov */

#include "utils.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int count_char_entries(const char *str, char ch)
{
    int cnt = 0;
    while (*str) {
        if (*str == ch) {
            cnt++;
        }
        str++;
    }
    return cnt;
}

char *rpd_strdup(const char *src)
{
    size_t size = strlen(src) + 1;
    char *dest = (char *) malloc(sizeof(char) * size);
    if (!dest) {
        return NULL;
    }
    return memcpy(dest, src, size);
}

char *rpd_strsep(char **str, const char *sep)
{
    char *s = *str, *end;
    if (!s) {
        return NULL;
    }

    end = s + strcspn(s, sep);
    if (*end) {
        *end++ = 0;
    } else {
        end = 0;
    }
    *str = end;
    return s;
}

const char *rpd_splitbyc(char **dest1, char **dest2, const char *src, const char sep)
{
    const char *start = src, *end = src;

    if (!src)
        return 0;

    while (*end) {
        if (*end == sep) {
            size_t len = end - start;
            *dest1 = malloc(sizeof(char) * (len + 1));
            if (!*dest1) {
                perror("malloc");
                return NULL;
            }
            memcpy(*dest1, start, len);
            (*dest1)[len] = '\0';

            end++;
            len = strlen(start) - (end - start);
            if (!len) {
                *dest2 = NULL;
                return 0;
            }

            *dest2 = malloc(sizeof(char) * (len + 1));
            if ((!*dest2)) {
                perror("malloc");
                return NULL;
            }
            memcpy(*dest2, end, len);
            (*dest2)[len + 1] = '\0';
            return 0;
        }
        end++;
    }

    return 0;
}

void rpd_strerase(char *src, int nchars)
{
    char *ptr = NULL;
    size_t len = strlen(src);
    if (!src)
        return;

    ptr = src + nchars;
    while (*ptr != '\0') {
        *(ptr - nchars) = *ptr;
        ptr++;
    }

    ptr = src + len;
    while (ptr >= (src + len) - nchars) {
        *ptr = '\0';
        ptr--;
    }
}