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csvnorm.c
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csvnorm.c
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/*
CSVC99 - SIMD-accelerated csv parser in C99
Copyright (c) 2019-2020 CK Tan
CSVC99 can be used for free under the GNU General Public License
version 3, where anything released into public must be open source,
or under a commercial license. The commercial license does not
cover derived or ported versions created by third parties under
GPL. To inquire about commercial license, please send email to
*/
#define _GNU_SOURCE
#include "csv.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
const char *pname = 0;
const char *fname = 0;
int ncol = 0;
int qte = '"';
int esc = '"';
int delim = ',';
char nullstr[20] = {0};
#define perr(M, ...) fprintf(stderr, M, ##__VA_ARGS__)
#define pout(M, ...) fprintf(stdout, M, ##__VA_ARGS__)
#define fatal(M, ...) \
do { \
fprintf(stderr, M, ##__VA_ARGS__); \
exit(1); \
} while (0)
void usage(int exitcode, const char *msg) {
perr("Normalize CSV format\n");
perr(" - use comma as delimiter\n");
perr(" - quote columns with special chars\n");
perr(" - escape quote inside quoted columns\n");
perr(" - NULL for null\n");
perr("\n");
perr("Usage: %s [-h] [-d delim] [-q quote] [-e esc] [-n nullstr] [FILE]\n",
pname);
perr("%s", "\n\
OPTIONS: \n\
\n\
-h : print this message \n\
-q quote : specify quote char; default to double-quote \n\
-e esc : specify escape char; default to the quote char \n\
-n nullstr : specify string representing null; \n\
\n\
");
if (msg) {
perr("\n%s\n", msg);
}
exit(exitcode);
}
void parse_cmdline(int argc, char *const *argv) {
pname = argv[0];
int opt;
char *q, *e, *d, *n;
q = e = d = n = 0;
while ((opt = getopt(argc, argv, "d:q:e:n:h")) != -1) {
switch (opt) {
case 'd':
d = optarg;
break;
case 'q':
q = optarg;
break;
case 'e':
e = optarg;
break;
case 'n':
n = optarg;
break;
case 'h':
usage(0, 0);
break;
default:
usage(1, 0);
break;
}
}
/* fname */
if (optind == argc)
; /* read from stdin */
else if (optind + 1 == argc)
fname = argv[optind];
else
usage(1, "Error: please supply only one filename");
/* qte */
if (q) {
if (strlen(q) != 1) {
usage(1, "Error: -q quote-char expects a single char.");
}
qte = q[0];
}
/* esc */
if (e) {
if (strlen(e) != 1) {
usage(1, "Error: -e escape-char expects a single char.");
}
esc = e[0];
}
/* delim */
if (d) {
if (strlen(d) != 1) {
usage(1, "Error: -d delim-char expects a single char.");
}
delim = d[0];
}
/* nullstr */
if (n) {
if (strlen(n) >= 20) {
usage(1, "Error: -n nullstr is too long. max is 19 chars");
}
strcpy(nullstr, n);
}
}
void print_special(char *s) {
putchar('"');
for (; *s; s++) {
if (*s == '"') {
putchar('"');
}
putchar(*s);
}
putchar('"');
}
int do_read(intptr_t handle, char *buf, int bufsz) {
FILE *fp = (FILE *)handle;
return fread(buf, 1, bufsz, fp);
}
int do_row(intptr_t handle, int64_t rownum, char **col, int ncol) {
(void)handle;
(void)rownum;
for (int i = 0; i < ncol; i++) {
char *s = col[i];
printf("%s", i ? "," : "");
if (s) {
/* search for dquote, comma, newline, or empty string */
if (strpbrk(s, "\",\r\n") || *s == 0) {
print_special(s);
} else {
printf("%s", s);
}
} else {
printf("NULL");
}
}
printf("\r\n");
return 0;
}
void do_error(intptr_t handle, int errtype, const char *errmsg,
csv_parse_t *cp) {
(void)handle;
(void)errtype;
errmsg = cp ? csv_errmsg(cp) : errmsg;
fatal("ERROR: %s\n", errmsg);
}
int main(int argc, char *argv[]) {
parse_cmdline(argc, argv);
FILE *fp = stdin;
if (fname) {
if (0 == (fp = fopen(fname, "r"))) {
fprintf(stderr, "fopen(%s): %s", fname, strerror(errno));
exit(1);
}
}
csv_scan((intptr_t)fp, qte, esc, delim, nullstr, do_read, do_row, do_error);
fclose(fp);
return 0;
}