Databases
StackOverflow2013
Postsdbo
POsimple way to delimit whitespace (once) in C when already using another delimiter
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POsimple way to delimit whitespace (once) in C when already using another delimiter
    primarykey
    data
    text
    <p>I have the following code</p> <pre><code>while (*ptr != ',') { int items_read = sscanf(ptr, "%91[^,]%n", field, &amp;n); printf("field = \"%s\"\n", field); field[0]='\0'; if (items_read == 1) ptr += n; /* advance the pointer by the number of characters read */ if ( *ptr != ',' ) { break; /* didn't find an expected delimiter, done? */ } ++ptr; /* skip the delimiter */ } </code></pre> <p>It reads through my string and creates a new array for each string it finds between the commas, however I have white space in the middle of the string. I have many strings that will be read in, and some of those have white space in more than one area (after that middle place) and I do not want that white space accounted for, just the first instances.</p> <p>I know I can put <code>|| ' '</code> on the <code>while line</code>, the <code>int line</code>, and/or the second <code>if line</code> but I haven't gotten to do what I need done.</p> <p>I've heard that using <code>strtok</code> isn't good, or at least there are better ways to do that. I do not know how to add additional 'flags' (like the commas in my code) for the code to by-pass. </p> <p>ex:<br> 3,875,837 file1.ext<br> 3,437,281 document two.txt</p> <p>I already have the beginnings doing what I want. </p> <pre><code>field1 = 3 field2 = 875 field3 = 837 </code></pre> <p>However I want the rest of the string on those 2 inputs to go into separate char arrays and print out as follows: </p> <pre><code>field4 = file1 field5 = ext </code></pre> <p>and </p> <pre><code>field4 = document field5 = two field6 = txt </code></pre> <p>Or, I'm thinking now, is there anyway I can extract the last iteration of that <code>char array field</code> in order to use another loop through the exact same code except replace the <code>,</code>s with <code>' '</code> spaces?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. US1337475
    1. US1337475
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POsimple way to delimit whitespace (once) in C when already using another delimiter
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    2. VO
      singulars
      1. POsimple way to delimit whitespace (once) in C when already using another delimiter
      1. This table or related slice is empty.
      1. VTUpMod
    1. COIf `ptr` points to null terminated array make it safer with: `while (*ptr && *ptr != ',') {` …
      singulars
      1. POsimple way to delimit whitespace (once) in C when already using another delimiter
      1. USMorpfh
    2. CO`strtok` writes zero bytes into the input argument, destroying its contents basically, so if you 1) want to use it with a literal constant, or b) you need the input string later, you'll have to make a working copy first and call `strtok` on that. Other than that, it's not a bad function!
      singulars
      1. POsimple way to delimit whitespace (once) in C when already using another delimiter
      1. USMr Lister
    3. CO@Rune: as of right now ptr is pointing to `char str[]` which I have initialized to my 'sample' string I'm testing with. I suppose when I am "inputting" all the separate strings I won't be directly putting them into my char array `str` I don't know; I am fairly new to programming so I'm not even sure how I would go about bringing in all my strings after I get this code working. A sscanf with gets() or something I suppose. @Mr.Lister Thank you that makes perfect sense I didn't really know how strtok worked inside but I have a much better understanding and feel comfortable experimenting with it.
      singulars
      1. POsimple way to delimit whitespace (once) in C when already using another delimiter
      1. US1337475
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload