First commit
This commit is contained in:
commit
68eec1a085
8
Makefile
Normal file
8
Makefile
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@ -0,0 +1,8 @@
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CC=cc
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CFLAGS=-Wall -pedantic
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on-stock: on-stock.o
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${CC} ${CFLAGS} on-stock.o -o on-stock
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clean:
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rm -f on-stock.o on-stock
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287
on-stock.c
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287
on-stock.c
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define FILEMAXLENGTH 50
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#define NAMEMAXLENGTH 30
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struct myData
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{
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char name[NAMEMAXLENGTH];
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int quantity;
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float price;
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};
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void list(struct myData *datap, int numRec);
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void search(struct myData *datap, int numRec);
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void modify(struct myData *datap, int numRec);
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void delete(struct myData *datap, int numRec);
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int new(struct myData *datap, int numRec);
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int main(int argc, char* argv[])
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{
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int numRec;
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int create;
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int choice;
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int opt;
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char filename[FILEMAXLENGTH] = "alloctest.bin";
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if (argc != 2)
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{
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fprintf(stderr, "Usage: %s [-l] [-s] [-m [-m [-n] [-f filename]\n"
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"-l = list the articles in the database\n"
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"-s = search for an article in the database\n"
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"-m = modify a article\n"
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"-r = remove a article\n"
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"-n = create a new article\n"
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"-f = specifiy a filename for the database\n", argv[0]);
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return 1;
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}
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/* Process command line arugments */
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while ((opt = getopt(argc, argv, "lsmrnf:")) != -1)
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{
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switch (opt)
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{
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case 'l':
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choice = 'l';
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break;
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case 's':
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choice = 's';
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break;
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case 'm':
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choice = 'm';
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break;
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case 'r':
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choice = 'r';
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break;
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case 'n':
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choice = 'n';
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break;
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case 'f':
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strncpy(filename, optarg, FILEMAXLENGTH-1);
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break;
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default:
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fprintf(stderr, "Usage: %s [-l] [-s] [-m [-m [-n] [-f filename]\n"
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"-l = list the articles in the database\n"
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"-s = search for an article in the database\n"
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"-m = modify a article\n"
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"-r = remove a article\n"
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"-n = create a new article\n"
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"-f = specifiy a filename for the database\n", argv[0]);
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return 1;
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}
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}
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/* Check if file exists, if it dosen't, create it */
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if ( access(filename, R_OK|W_OK) != 0 )
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{
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printf("Kan inte öppna %s\n", filename);
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printf("Skapa filen och lägg till artiklar? (j/n): ");
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create = getchar();
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if ( create == 'j' )
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{
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numRec = 1;
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struct myData *data;
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data = calloc(numRec, sizeof(struct myData));
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new(data, numRec);
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free(data);
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}
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else
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return 1;
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}
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struct myData *data;
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if ( choice == 'l' || choice == 's' || choice == 'm' || choice == 'r' )
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{
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/* Open file in read-mode */
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FILE *fp = fopen("alloctest.bin", "rb");
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/* Read in the content from the file to the structure */
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fseek(fp, 0, SEEK_END);
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numRec = ftell(fp) / sizeof(struct myData);
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data = calloc(numRec, sizeof(struct myData));
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rewind(fp);
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fread(data, sizeof(struct myData), numRec, fp);
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fclose(fp);
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if ( choice == 'l' )
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list(data, numRec);
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else if ( choice == 's' )
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search(data, numRec);
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else if ( choice == 'm' )
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modify(data, numRec);
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else if ( choice == 'r' )
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delete(data, numRec);
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}
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else if ( choice == 'n' )
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{
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data = calloc(1, sizeof(struct myData));
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new(data, numRec);
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}
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free(data);
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return 0;
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}
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void list(struct myData *datap, int numRec)
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{
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for (int i = 0; i<numRec; i++)
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{
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printf("Name: %s\n", datap[i].name);
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printf("Quantity: %d\n", datap[i].quantity);
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printf("Price: %f\n", datap[i].price);
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printf("\n");
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}
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}
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void search(struct myData *datap, int numRec)
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{
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char searchword[NAMEMAXLENGTH];
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printf("Name: ");
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fgets(searchword, NAMEMAXLENGTH, stdin);
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searchword[strcspn(searchword, "\n")] = '\0';
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printf("\n");
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for (int i = 0; i<numRec; i++)
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{
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if ( strcmp(searchword, datap[i].name) != 0 )
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continue;
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printf("Name: %s\n", datap[i].name);
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printf("Quantity: %d\n", datap[i].quantity);
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printf("Price: %f\n", datap[i].price);
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printf("\n");
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}
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}
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void modify(struct myData *datap, int numRec)
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{
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char searchword[NAMEMAXLENGTH];
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char what[10];
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char quant[20];
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printf("Name: ");
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fgets(searchword, NAMEMAXLENGTH, stdin);
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searchword[strcspn(searchword, "\n")] = '\0';
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printf("\n");
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for (int i = 0; i<numRec; i++)
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{
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if ( strcmp(searchword, datap[i].name) == 0 )
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{
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printf("Namn: %s\n", datap[i].name);
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printf("Quantity: %d\n", datap[i].quantity);
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printf("Price: %f\n", datap[i].price);
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printf("\n");
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printf("What do you like to modify? (name, quantity, price): ");
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scanf("%9s", what);
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if ( strcmp(what, "name") == 0 )
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{
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printf("Name: "); scanf("%29s", datap[i].name);
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}
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else if ( strcmp(what, "quantity") == 0 )
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{
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printf("Quantity (absolute value or +/-NUMBER: "); scanf("%19s", quant);
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printf("Sign: %c\n", quant[0]);
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if (quant[0] == '+')
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datap[i].quantity = datap[i].quantity + atoi(quant);
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else if (quant[0] == '-')
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{
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quant[0] = ' ';
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datap[i].quantity = datap[i].quantity - atoi(quant);
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}
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else
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datap[i].quantity = atoi(quant);
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}
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else if ( strcmp(what, "price") == 0 )
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{
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printf("Price: "); scanf("%f", &datap[i].price);
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}
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}
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}
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FILE *newfp = fopen("alloctest.bin", "wb");
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fwrite(datap, sizeof(struct myData), numRec, newfp);
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fclose(newfp);
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}
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void delete(struct myData *datap, int numRec)
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{
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char searchword[NAMEMAXLENGTH];
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int answer;
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printf("Name: ");
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fgets(searchword, NAMEMAXLENGTH, stdin);
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searchword[strcspn(searchword, "\n")] = '\0';
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printf("\n");
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for (int i = 0; i<numRec; i++)
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{
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if ( strcmp(searchword, datap[i].name) == 0 )
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{
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printf("Name: %s\n", datap[i].name);
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printf("Quantity: %d\n", datap[i].quantity);
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printf("Price: %f\n", datap[i].price);
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printf("\n");
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printf("Delete the record listed above? (y/n): ");
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answer = getchar();
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if ( answer == 'y' )
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{
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FILE *newfp = fopen("alloctest.bin", "wb");
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for (int j = 0; j<numRec; j++)
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{
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if ( strcmp(searchword, datap[j].name) == 0 )
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continue;
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fwrite(&datap[j], sizeof(struct myData), 1, newfp);
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}
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fclose(newfp);
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}
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}
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else
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{
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printf("%s not found in database\n", searchword);
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}
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}
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}
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int new(struct myData *datap, int numRec)
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{
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int bytes;
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FILE *fp = fopen("alloctest.bin", "ab");
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if (fp == NULL)
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{
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printf("Can't open file for writing\n");
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return 1;
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}
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for (;;)
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{
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printf("Name: ('done' if finish) ");
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fgets(datap->name, NAMEMAXLENGTH, stdin);
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datap->name[strcspn(datap->name, "\n")] = '\0';
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if ( strcmp(datap->name, "klar") == 0 )
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{
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fclose(fp);
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return 0;
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}
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printf("Quantity: "); scanf("%d", &datap->quantity);
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printf("Price: "); scanf("%f", &datap->price);
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bytes = fwrite(datap, sizeof(struct myData), 1, fp);
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if (bytes != 1)
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{
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printf("Kunde inte skriva till filen!\n");
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return 1;
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}
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}
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}
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