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/* csv - read write comma separated value format
 * Copyright (c) 2003 Michael B. Allen <mba2000 ioplex.com>
 *
 * The MIT License
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <wchar.h>
#include <wctype.h>

#include "mba/msgno.h"
#include "mba/csv.h"

#define ST_START     1
#define ST_COLLECT   2
#define ST_TAILSPACE 3
#define ST_END_QUOTE 4

struct sinput {
    FILE *in;
    const unsigned char *src;
    size_t sn;
    size_t count;
};
struct winput {
    const wchar_t *src;
    size_t sn;
    size_t count;
};

static int
snextch(struct sinput *in)
{
    int ch;

    if (in->in) {
        if ((ch = fgetc(in->in)) == EOF) {
            if (ferror(in->in)) {
                PMNO(errno);
                return -1;
            }
            return 0;
        }
    } else {
        if (in->sn == 0) {
            return 0;
        }
        ch = *(in->src)++;
        in->sn--;
    }
    in->count++;

    return ch;
}
static int
wnextch(struct winput *in)
{
    int ch;

    if (in->sn == 0) {
        return 0;
    }
    ch = *(in->src)++;
    in->sn--;
    in->count++;

    return ch;
}

static int
csv_parse_str(struct sinput *in,
            unsigned char *buf,
            size_t bn,
            unsigned char *row[],
            int rn,
            int sep,
            int flags)
{
    int trim, quotes, ch, state, r, j, t, inquotes;

    trim = flags & CSV_TRIM;
    quotes = flags & CSV_QUOTES;
    state = ST_START;
    inquotes = 0;
    ch = r = j = t = 0;

    memset(row, 0, sizeof(unsigned char *) * rn);

    while (rn && bn && (ch = snextch(in)) > 0) {
        switch (state) {
            case ST_START:
                if (ch != '\n' && ch != sep && isspace(ch)) {
                    if (!trim) {
                        buf[j++] = ch; bn--;
                        t = j;
                    }
                    break;
                } else if (quotes && ch == '"') {
                    j = t = 0;
                    state = ST_COLLECT;
                    inquotes = 1;
                    break;
                }
                state = ST_COLLECT;
            case ST_COLLECT:
                if (inquotes) {
                    if (ch == '"') {
                        state = ST_END_QUOTE;
                        break;
                    }
                } else if (ch == sep || ch == '\n') {
                    row[r++] = buf; rn--;
                    if (ch == '\n' && t && buf[t - 1] == '\r') {
                        t--; bn++; /* crlf -> lf */
                    }
                    buf[t] = '\0'; bn--;
                    buf += t + 1;
                    j = t = 0;
                    state = ST_START;
                    inquotes = 0;
                    if (ch == '\n') {
                        rn = 0;
                    }
                    break;
                } else if (quotes && ch == '"') {
                    PMNF(errno = EILSEQ, ": unexpected quote in element %d", (r + 1));
                    return -1;
                }
                buf[j++] = ch; bn--;
                if (!trim || isspace(ch) == 0) {
                    t = j;
                }
                break;
            case ST_TAILSPACE:
            case ST_END_QUOTE:
                if (ch == sep || ch == '\n') {
                    row[r++] = buf; rn--;
                    buf[j] = '\0'; bn--;
                    buf += j + 1;
                    j = t =  0;
                    state = ST_START;
                    inquotes = 0;
                    if (ch == '\n') {
                        rn = 0;
                    }
                    break;
                } else if (quotes && ch == '"' && state != ST_TAILSPACE) {
                    buf[j++] = '"'; bn--;        /* nope, just an escaped quote */
                    t = j;
                    state = ST_COLLECT;
                    break;
                } else if (isspace(ch)) {
                    state = ST_TAILSPACE;
                    break;
                }
                errno = EILSEQ;
                PMNF(errno, ": bad end quote in element %d", (r + 1));
                return -1;
        }
    }
    if (ch == -1) {
        AMSG("");
        return -1;
    }
    if (bn == 0) {
        PMNO(errno = E2BIG);
        return -1;
    }
    if (rn) {
        if (inquotes && state != ST_END_QUOTE) {
            PMNO(errno = EILSEQ);
            return -1;
        }
        row[r] = buf;
        buf[t] = '\0';
    }

    return in->count;
}
static int
csv_parse_wcs(struct winput *in, wchar_t *buf, size_t bn, wchar_t *row[], int rn, wint_t sep, int flags)
{
    int trim, quotes, state, r, j, t, inquotes;
    wint_t ch;

    trim = flags & CSV_TRIM;
    quotes = flags & CSV_QUOTES;
    state = ST_START;
    inquotes = 0;
    ch = r = j = t = 0;

    memset(row, 0, sizeof(wchar_t *) * rn);

    while (rn && bn && (ch = wnextch(in)) > 0) {
        switch (state) {
            case ST_START:
                if (ch != L'\n' && ch != sep && iswspace(ch)) {
                    if (!trim) {
                        buf[j++] = ch; bn--;
                        t = j;
                    }
                    break;
                } else if (quotes && ch == L'"') {
                    j = t = 0;
                    state = ST_COLLECT;
                    inquotes = 1;
                    break;
                }
                state = ST_COLLECT;
            case ST_COLLECT:
                if (inquotes) {
                    if (ch == L'"') {
                        state = ST_END_QUOTE;
                        break;
                    }
                } else if (ch == sep || ch == L'\n') {
                    row[r++] = buf; rn--;
                    buf[t] = L'\0'; bn--;
                    buf += t + 1;
                    j = t = 0;
                    state = ST_START;
                    inquotes = 0;
                    if (ch == L'\n') {
                        rn = 0;
                    }
                    break;
                } else if (quotes && ch == L'"') {
                    PMNF(errno = EILSEQ, ": unexpected quote in element %d", (r + 1));
                    return -1;
                }
                buf[j++] = ch; bn--;
                if (!trim || iswspace(ch) == 0) {
                    t = j;
                }
                break;
            case ST_TAILSPACE:
            case ST_END_QUOTE:
                if (ch == sep || ch == L'\n') {
                    row[r++] = buf; rn--;
                    buf[j] = L'\0'; bn--;
                    buf += j + 1;
                    j = t =  0;
                    state = ST_START;
                    inquotes = 0;
                    if (ch == L'\n') {
                        rn = 0;
                    }
                    break;
                } else if (quotes && ch == L'"' && state != ST_TAILSPACE) {
                    buf[j++] = L'"'; bn--;       /* nope, just an escaped quote */
                    t = j;
                    state = ST_COLLECT;
                    break;
                } else if (iswspace(ch)) {
                    state = ST_TAILSPACE;
                    break;
                }
                PMNF(errno = EILSEQ, ": bad end quote in element %d", (r + 1));
                return -1;
        }
    }
    if (ch == (wint_t)-1) {
        AMSG("");
        return -1;
    }
    if (bn == 0) {
        PMNO(errno = E2BIG);
        return -1;
    }
    if (rn) {
        if (inquotes && state != ST_END_QUOTE) {
            PMNO(errno = EILSEQ);
            return -1;
        }
        row[r] = buf;
        buf[t] = L'\0';
    }

    return in->count;
}
int
csv_row_parse_wcs(const wchar_t *src, size_t sn, wchar_t *buf, size_t bn, wchar_t *row[], int rn, int sep, int trim)
{
    struct winput input;
    input.src = src;
    input.sn = sn;
    input.count = 0;
    return csv_parse_wcs(&input, buf, bn, row, rn, (wint_t)sep, trim);
}
int
csv_row_parse_str(const unsigned char *src, size_t sn, unsigned char *buf, size_t bn, unsigned char *row[], int rn, int sep, int trim)
{
    struct sinput input;
    input.in = NULL;
    input.src = src;
    input.sn = sn;
    input.count = 0;
    return csv_parse_str(&input, buf, bn, row, rn, sep, trim);
}
int
csv_row_fread(FILE *in, unsigned char *buf, size_t bn, unsigned char *row[], int numcols, int sep, int trim)
{
    struct sinput input;
    input.in = in;
    input.count = 0;
    return csv_parse_str(&input, buf, bn, row, numcols, sep, trim);
}