commit 4e1d33e5487d561be4bfb5dfc962718d2689d512
parent 9f1ea74d9dbd70df603318e6ca3fdd6bd473c039
Author: phoebos <ben@bvnf.space>
Date: Sat, 2 Oct 2021 11:40:42 +0000
read data
Diffstat:
| M | csv.c | | | 82 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------- |
| M | test.csv | | | 11 | ++++++----- |
2 files changed, 78 insertions(+), 15 deletions(-)
diff --git a/csv.c b/csv.c
@@ -29,30 +29,92 @@ read from stdin\n", argv[0]);
/* read header */
int c;
+ int ncols = 0;
char *n = malloc(MAX_LINE);
char *np = n;
while ((c = fgetc(f)) != EOF) {
- fprintf(stderr, "got %c\n", c);
- if (c == '\n') goto storeit;
- if (c == ',') {
- printf("its a ,\n");
-storeit:
+ if (c == ',' || c == '\n') {
*np++ = '\0';
*headerp = malloc(sizeof n * sizeof *n);
strcpy(*headerp, n);
headerp++;
- //*header = n;
- //header += sizeof n;
- n = np;
+ np = n;
+ ncols++;
+ if (c == '\n') break;
continue;
}
*np++ = c;
}
- fprintf(stderr, "reading\n");
-
do {
printf("%s ", *header);
+ free(*header);
} while (*++header);
+ puts("");
+
+ /* read data */
+ int nrows = 0;
+ float **data;
+ data = malloc(sizeof (float *) * (nrows + 1));
+ if (data == NULL) {
+ perror("malloc");
+ goto fail;
+ }
+ data[0] = malloc(sizeof (float) * ncols);
+ if (data[0] == NULL) {
+ perror("malloc");
+ goto fail;
+ }
+ np = n;
+ int x, y;
+ x = y = 0;
+ while ((c = fgetc(f)) != EOF) {
+ if (c == ',' || c == '\n') {
+ if (n == np) {
+ /* nothing in this column */
+ fprintf(stderr, "warning: empty cell at row %d, col %d\n", y + 1, x + 1);
+ data[y][x] = 0.;
+ } else {
+ *np++ = '\0';
+ data[y][x] = (float)atof(n);
+ np = n;
+ }
+ x++;
+ if (c == '\n') {
+ nrows++;
+ y++;
+ x = 0;
+ data = realloc(data, sizeof (float *) * (nrows + 1));
+ if (data == NULL) {
+ perror("malloc");
+ goto fail;
+ }
+ data[y] = malloc(sizeof (float) * ncols);
+ if (data[y] == NULL) {
+ perror("malloc");
+ goto fail;
+ }
+ continue;
+ }
+ continue;
+ }
+ *np++ = c;
+ }
+ for (int i = 0; i < nrows; i++) {
+ for (int j = 0; j < ncols; j++)
+ printf("%g\t", data[i][j]);
+ printf("\n");
+ }
+ printf("table has %d rows of %d columns\n", nrows, ncols);
+
+ free(n);
+ free(data);
+
+
fclose(f);
return 0;
+fail:
+ fclose(f);
+ free(n);
+ free(data);
+ return 1;
}
diff --git a/test.csv b/test.csv
@@ -1,5 +1,6 @@
-date,name,quantity
-1,me,0
-2,ben,5
-3,mia,123
-4,you,65225
+date,quantity
+1,0.166
+2,5
+3,123
+4,65225
+,999
