StrList.cc

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/*
 * Copyright (C) 1996-2025 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */
 
/* DEBUG: section 66    HTTP Header Tools */
 
#include "squid.h"
#include "base/TextException.h"
#include "sbuf/SBuf.h"
#include "SquidString.h"
#include "StrList.h"
 
void
strListAdd(String &str, const char *item, const size_t itemSize, const char delimiter)
{
    if (str.size()) {
        const char buf[] = { delimiter, ' ' };
        const auto bufSize = sizeof(buf);
        Must(str.canGrowBy(bufSize));
        str.append(buf, bufSize);
    }
    Must(str.canGrowBy(itemSize));
    str.append(item, itemSize);
}
 
void
strListAdd(String *str, const char *item, const char delimiter)
{
    assert(str);
    assert(item);
    strListAdd(*str, item, strlen(item), delimiter);
}
 
void
strListAdd(String &str, const SBuf &item, char delimiter)
{
    strListAdd(str, item.rawContent(), item.length(), delimiter);
}
 
int
strListIsMember(const String * list, const SBuf &m, char del)
{
    const char *pos = nullptr;
    const char *item;
    int ilen = 0;
 
    assert(list);
    int mlen = m.plength();
    while (strListGetItem(list, del, &item, &ilen, &pos)) {
        if (mlen == ilen && m.caseCmp(item, ilen) == 0)
            return 1;
    }
    return 0;
}
 
int
strListIsSubstr(const String * list, const char *s, char del)
{
    assert(list && del);
    return (list->find(s) != String::npos);
}
 
int
strListGetItem(const String * str, char del, const char **item, int *ilen, const char **pos)
{
    size_t len;
    /* ',' is always enabled as field delimiter as this is required for
     * processing merged header values properly, even if Cookie normally
     * uses ';' as delimiter.
     */
    static char delim[3][8] = {
        "\"?,",
        "\"\\",
        " ?,\t\r\n"
    };
    int quoted = 0;
    assert(str && item && pos);
 
    delim[0][1] = del;
    delim[2][1] = del;
 
    if (!*pos) {
        *pos = str->termedBuf();
 
        if (!*pos)
            return 0;
    }
 
    /* skip leading whitespace and delimiters */
    *pos += strspn(*pos, delim[2]);
 
    *item = *pos;       /* remember item's start */
 
    /* find next delimiter */
    do {
        *pos += strcspn(*pos, delim[quoted]);
        if (**pos == '"') {
            quoted = !quoted;
            *pos += 1;
        } else if (quoted && **pos == '\\') {
            *pos += 1;
            if (**pos)
                *pos += 1;
        } else {
            break;      /* Delimiter found, marking the end of this value */
        }
    } while (**pos);
 
    len = *pos - *item;     /* *pos points to del or '\0' */
 
    /* rtrim */
    while (len > 0 && xisspace((*item)[len - 1]))
        --len;
 
    if (ilen)
        *ilen = len;
 
    return len > 0;
}
 
SBuf
getListMember(const String &list, const char *key, const char delimiter)
{
    const char *pos = nullptr;
    const char *item = nullptr;
    int ilen = 0;
    const auto keyLen = strlen(key);
    while (strListGetItem(&list, delimiter, &item, &ilen, &pos)) {
        if (static_cast<size_t>(ilen) > keyLen && strncmp(item, key, keyLen) == 0 && item[keyLen] == '=')
            return SBuf(item + keyLen + 1, ilen - keyLen - 1);
    }
    return SBuf();
}