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Check if file passed via -G+l has at least one numeric column as it must #8798

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Merged
joa-quim merged 1 commit into from
Sep 22, 2025
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Merged

Check if file passed via -G+l has at least one numeric column as it must #8798

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1 change: 1 addition & 0 deletions doc/rst/source/grdtrack.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -87,6 +87,7 @@ Required Arguments
|-G| as many times as you have grids you wish to sample.
Alternatively, use **-G+l**\ *list* to pass a file whose first word
in the trailing text record will be extracted as the file names.
Note, this means that file must have at least one numeric column before the text holding the grid names.
The grids are sampled and results are output in the order given.
(See :ref:`Grid File Formats <grd_inout_full>`). **Note**: If *gridfile*
is a remote global grid and no registration is specified then **grdtrack**
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13 changes: 9 additions & 4 deletions src/grdtrack.c
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Expand Up @@ -389,18 +389,23 @@ static int parse (struct GMT_CTRL *GMT, struct GRDTRACK_CTRL *Ctrl, struct GMT_O
n_errors++;
break;
}
if ((c = strstr (opt->arg, "+l"))) { /* Gave +l<listofgrids> */
if ((c = strstr(opt->arg, "+l"))) { /* Gave +l<listofgrids> */
char file[PATH_MAX] = {""};
struct GMT_DATASET *L = NULL;
struct GMT_DATASEGMENT *S = NULL;
uint64_t row;
if (c[2] == '\0') { /* No list file given */
GMT_Report (API, GMT_MSG_ERROR, "Option -G: No listfile appended after modifier +l\n");
GMT_Report(API, GMT_MSG_ERROR, "Option -G: No listfile appended after modifier +l\n");
n_errors++;
break;
}
if ((L = GMT_Read_Data (API, GMT_IS_DATASET, GMT_IS_FILE, GMT_IS_NONE, GMT_READ_NORMAL, NULL, &c[2], NULL)) == NULL) {
GMT_Report (API, GMT_MSG_WARNING, "Error reading list file %s\n", &c[2]);
if ((L = GMT_Read_Data(API, GMT_IS_DATASET, GMT_IS_FILE, GMT_IS_NONE, GMT_READ_NORMAL, NULL, &c[2], NULL)) == NULL) {
GMT_Report(API, GMT_MSG_WARNING, "Error reading list file %s\n", &c[2]);
n_errors++;
break;
}
if (L->table[0]->n_segments == 0) {
GMT_Report(API, GMT_MSG_WARNING, "The list file, %s, must have at least one numeric column before the grid names.\n", &c[2]);
n_errors++;
break;
}
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