jackbenny/on-stock
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Added some more comments to the code

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This commit is contained in:
Jack-Benny Persson 2017-07-09 23:05:12 +02:00
parent 3cc197dbc9
commit 54e6168672
1 changed files with 10 additions and 1 deletions
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11
on-stock.c
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@ -88,8 +88,10 @@ int main(int argc, char* argv[])
return 1; return 1;
} }
/* The structure to contain our database */
struct myData *data; struct myData *data;
/* Continue processesing the command-line arugments */
if ( choice == 'l' || choice == 's' || choice == 'm' || choice == 'd' ) if ( choice == 'l' || choice == 's' || choice == 'm' || choice == 'd' )
{ {
/* Open file in read-mode */ /* Open file in read-mode */
@ -102,7 +104,6 @@ int main(int argc, char* argv[])
rewind(fp); rewind(fp);
fread(data, sizeof(struct myData), numRec, fp); fread(data, sizeof(struct myData), numRec, fp);
fclose(fp); fclose(fp);
if ( choice == 'l' ) if ( choice == 'l' )
list(data, numRec); list(data, numRec);
@ -129,6 +130,7 @@ int main(int argc, char* argv[])
return 0; return 0;
} }
void list(struct myData *datap, int numRec) void list(struct myData *datap, int numRec)
{ {
printHeader(); printHeader();
@ -148,6 +150,7 @@ void search(struct myData *datap, int numRec)
printf("Name: "); printf("Name: ");
fgets(searchword, NAMEMAXLENGTH, stdin); fgets(searchword, NAMEMAXLENGTH, stdin);
/* Replace the newline character with a null character */
searchword[strcspn(searchword, "\n")] = '\0'; searchword[strcspn(searchword, "\n")] = '\0';
printf("\n"); printf("\n");
@ -195,10 +198,12 @@ void modify(struct myData *datap, int numRec)
printf("Quantity (absolute value or +/-NUMBER: "); printf("Quantity (absolute value or +/-NUMBER: ");
fgets(quant, 20, stdin); fgets(quant, 20, stdin);
quant[strcspn(quant, "\n")] = '\0'; quant[strcspn(quant, "\n")] = '\0';
/* Process the first character */
if (quant[0] == '+') if (quant[0] == '+')
datap[i].quantity = datap[i].quantity + atoi(quant); datap[i].quantity = datap[i].quantity + atoi(quant);
else if (quant[0] == '-') else if (quant[0] == '-')
{ {
/* We need to replace the - with a space before atoi */
quant[0] = ' '; quant[0] = ' ';
datap[i].quantity = datap[i].quantity - atoi(quant); datap[i].quantity = datap[i].quantity - atoi(quant);
} }
@ -240,6 +245,8 @@ void delete(struct myData *datap, int numRec)
if ( answer == 'y' ) if ( answer == 'y' )
{ {
FILE *newfp = fopen(filename, "wb"); FILE *newfp = fopen(filename, "wb");
/* Write out all records, except the one we cant to delete,
back to the file, one record at a time */
for (int j = 0; j<numRec; j++) for (int j = 0; j<numRec; j++)
{ {
if ( strcmp(searchword, datap[j].name) == 0 ) if ( strcmp(searchword, datap[j].name) == 0 )
@ -262,8 +269,10 @@ int new(struct myData *datap, int numRec)
return 1; return 1;
} }
/* Ask for, and write out, one record at a time */
for (;;) for (;;)
{ {
/* Clear the input buffer (from the previous iteration) */
setbuf(stdin, NULL); setbuf(stdin, NULL);
printf("Name ('done' when finished): "); printf("Name ('done' when finished): ");
fgets(datap->name, NAMEMAXLENGTH, stdin); fgets(datap->name, NAMEMAXLENGTH, stdin);