68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
#include <string.h>
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#include <stdlib.h>
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#include "string.h"
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char*
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easycsv_set_charp_to_value(const char *rowstr,
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unsigned int col)
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{
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/* Get first occurance of comma in str, the first value is ommited but not the comma */
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char *pch = (char*) rowstr;
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/* Repeat until desired col is found */
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for (unsigned int i = 1; i < col; i++) {
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pch = strpbrk(pch + 1, ",");
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}
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return pch;
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}
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char*
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easycsv_insert_string_row(const char* val,
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const char* rowstr,
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unsigned int col,
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unsigned int col_max)
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{
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size_t rowstrst = strlen(rowstr);
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size_t st = 0;
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size_t commas = 0;
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char *pch = NULL;
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char *newstr = NULL;
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/* column is within limit */
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if (1 <= col && col <= col_max) {
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/* Set pch to start of value in rowstr */
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pch = easycsv_set_charp_to_value(rowstr, col);
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/* Calculate size of existing value */
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st = strcspn(pch, ",");
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newstr = malloc(rowstrst - st + strlen(val) + 1);
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/* Copy char to newstr before value (pch) */
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strncpy(newstr, rowstr, pch - rowstr);
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strcat(newstr, val);
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/* Set pch to after value */
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pch = strchr(rowstr, ',');
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/* Calculate length of rest of string */
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st = strlen(pch);
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/* Concentate rest of string including NULL char */
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strcat(newstr, pch);
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}
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else {
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commas = col - col_max;
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// csv->cols = col;
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newstr = malloc(rowstrst + commas + strlen(val) + 1);
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strncpy(newstr, rowstr, rowstrst);
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for (size_t i = 0; i < commas; i++)
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strncat(newstr, ",", 1);
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strcat(newstr, val); // append \0
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}
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return newstr;
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}
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