📄 handleform.c
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/* Simple CGI program that returns grades *//* This program assumes each request will include the following fields (coming from an HTML form): fname : first name lname : last name ssn : Social Security Number The program looks up the grades for the individual corresponding to the fields and returns a list of grades. We don't actually have a database of grades (or names, or anything else) - the grades are just created randomly...*/#include <stdio.h>#include <string.h>#include <sys/types.h>#include <time.h>#include <stdlib.h>#include "cgilib.h" /* simple CGI request parsing routines */#define MAXFIELDS 10 /* Max number of fields we will handle *//* print HTML error message and exit */void fatal_error( char *s) { printf("<H1 ALIGN=CENTER><FONT COLOR=RED>\n"); printf("%s</FONT></H1>\n",s); exit(1);}/* see if a string contains any nonblank chars */int empty( char *s) { return(strlen(s)==strspn( s, " \t\n"));}char *grades[] = { "Test#1", "Test#2", "Test#2", "HW#1", "HW#2", "HW#3"};int n_grades = sizeof(grades)/sizeof(char *);int random_grade(void) { static int seeded=0; if (!seeded) { srand(time(NULL)); seeded=1; } return(50 + (int) (50.0*rand()/(RAND_MAX+1.0)));}/* generate_grade_table just makes up the grades, there is no database!!!!!*/void generate_grade_table(char *f, char *l, char *s) { int i,tot,grade; /* print the student name and SSN */ printf("<CENTER><H2>%s %s (%s) </CENTER>\n",f,l,s); /* print the grade table */ printf("<CENTER>\n"); printf("<TABLE BORDER=3>\n"); printf("<TR>\n"); for (i=0;i<n_grades;i++) printf(" <TH>%s</TH>\n",grades[i]); printf("<TH>Final<BR>Average</TH>\n"); printf("</TR>\n"); printf("<TR>\n"); tot=0; for (i=0;i<n_grades;i++) { grade = random_grade(); tot += grade; printf(" <TD>%d</TD>\n",grade); } printf(" <TD>%.2f</TD>\n",tot/(double)n_grades); printf("</TR>\n"); printf("</TABLE>\n\n"); printf("</CENTER>\n");}int main() { char *query; char *names[MAXFIELDS]; char *vals[MAXFIELDS]; char *lname,*fname,*ssn; int i,n; /* always tell the browser what kind of document we are sending */ /* NOTE: the web server that started the CGI program will send back the appropriate HTTP header !!! */ printf("Content-type: text/html\n\n"); /* now send some HTML stuff */ printf("<BODY BGCOLOR=#FFFFFF>\n"); printf("<H2 ALIGN=CENTER>Netprog grades delivered to your desktop</H2>\n"); query = get_request(); if (query==NULL) { /* we got nothing, or there is an error */ /* send back an HTML error message */ fatal_error("ERROR - Invalid query or something"); } /* parse the request string and chop into fields */ n = split_and_parse(query,names,vals,MAXFIELDS); /* If we got more then 3 fields, this is a bogus request */ if (n!=3) fatal_error("ERROR - Invalid query or something"); /* this is a crummy way to do it, we really need an associative array for handling the fields (C++?). */ lname=fname=ssn=NULL; for (i=0;i<3;i++) { if (strcasecmp(names[i],"fname")==0) { fname = vals[i]; } else if (strcasecmp(names[i],"lname")==0) { lname = vals[i]; } else if (strcasecmp(names[i],"ssn")==0) { ssn = vals[i]; } else { /* unknown field name - this is an error */ fatal_error("ERROR - Invalid field or something"); exit(1); } } /* Make sure we got them all */ if ((!lname) || (!fname) || (!ssn)) { /* missing field name - this is an error */ printf("ERROR - Missing field"); exit(1); } /* Make sure something was entered for each field */ if (empty(fname)) fatal_error("Error - no first name entered"); else if (empty(lname)) fatal_error("Error - no last name entered"); else if (empty(ssn)) fatal_error("Error - no SSN entered"); /* OK - everything checks out - now process the request */ generate_grade_table(fname,lname,ssn); return(0);}⌨️ 快捷键说明
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